The current evidence — drawn from 212 analysed papers spanning archaeology, ancient and modern genomics, palaeoclimatology, and historical linguistics — converges on a broad consensus that the first Americans descended from Northeast Asian/Siberian ancestors who crossed Beringia and entered the Americas primarily between ~16,000 and 14,600 years ago, most likely via a Pacific coastal route. Pre-Clovis sites across the hemisphere confirm human presence before the Clovis horizon (~13,000 BP), and the Ice-Free Corridor is now widely regarded as unavailable for the earliest migrations. Significant disagreements persist, however, on the exact timing of entry (whether any pre-LGM, >20,000 BP arrivals occurred), the number of founding migration waves, and the degree to which alternative routes — including a hypothetical Atlantic crossing — contributed to initial peopling.
Key findings:
- Beringia as the primary gateway: Genetic, archaeological, and linguistic data overwhelmingly support entry via Beringia; founding mtDNA haplogroups (A2, B2, C1, D1, and X2) and Y-chromosome haplogroups (Q-M3, Q-CTS1780, C3-MPB373) all trace to Siberian source populations.
- Pre-Clovis occupation is real: Multiple geographically dispersed sites (Monte Verde, Cooper's Ferry, Gault, Page-Ladson, Paisley Caves, Chiquihuite) predate the Clovis horizon; the Ice-Free Corridor was closed during the relevant period.
- Coastal route strongly supported: Coastal deglaciation preceded inland routes; dog genomics and Pacific coastal archaeological sites corroborate a kelp-highway dispersal.
- Beringian Standstill: Ancestral Native Americans underwent an isolation period of ~2.4–9,000 years in eastern Beringia before dispersing southward.
- Rapid continental spread: Once south of the ice, humans reached Patagonia by ~14,000–15,000 cal BP — spanning the hemisphere in roughly 1,500 years.
- Contested evidence for very early arrivals: A small number of sites (Chiquihuite Cave, Vale da Pedra Furada, Bluefish Caves) suggest possible pre-LGM human presence, but these remain contested on methodological grounds.
Key Point: All major genetic marker systems — mtDNA, Y-chromosome, and whole-genome data — independently identify a Northeast Asian/Siberian source population that entered the Americas through Beringia.
Key Evidence:
- Pan-American mtDNA haplogroups A2, B2, C1, and D1 trace back to six successful founder haplotypes from an ancestral Beringian population, with coalescence times averaging ~19,000 BP (Achilli et al., 2008).
- Y-chromosome analysis identifies three to four founding lineages (Q-M3, Q-CTS1780, C3-MPB373, and possibly C3-P39/Z30536), all with Siberian affinities (Pinotti et al., 2018; Ayub et al., 2018).
- Whole-genome data confirm that all present-day Native Americans descend from a single migration wave from Siberia no earlier than 23 ka, with an isolation period of up to 8,000 years in Beringia before southward dispersal (Raghavan et al., 2015).
- Ancient Palaeo-Siberian populations are identified as the closest known relatives to the ancestral Native Americans (M et al., 2019; TC et al., 2025).
- Genetic diversity in Native Americans decreases with geographic distance from the Bering Strait, consistent with a Beringian origin and southward spread (Wang et al., 2007).
Interpretation: The Beringian origin is the most robustly supported finding in this literature. Debate has shifted from whether Beringia was the entry point to how many waves passed through and by what route they subsequently dispersed southward.
Founding lineages include Q-M3 and Q-CTS1780 throughout the Americas, C3-MPB373 in South America, and possibly C3-P39/Z30536 in North America (Ayub et al., 2018).
Key Point: Ancestral Native Americans did not pass directly through Beringia to the Americas; instead, they underwent a prolonged isolation phase — the "Beringian Standstill" — lasting thousands of years.
Key Evidence:
- mtDNA analysis of 623 complete sequences from the Americas and Asia revealed a founding population that isolated in Beringia before dispersing (Tamm et al., 2007).
- The standstill duration is estimated at 2.7 ky or 4.6 ky depending on the demographic model used (Pinotti et al., 2018).
- Ancient DNA from 92 pre-contact individuals confirms a founding population isolated in eastern Beringia for ~2.4 to 9 thousand years after separating from eastern Siberian populations (Llamas et al., 2016).
- Native Americans harbour 20,424 unique high-frequency alleles originating in Beringia — a scale of unique variation comparable only to Africa and the Out-of-Africa bottleneck (SD & JC, 2022).
Interpretation: The Beringian Standstill implies that early Native Americans were not simply a passing through-population but a genetically distinct group whose diversity accumulated during prolonged isolation — explaining why Native Americans cluster more tightly with each other than with any living Siberian population.
Key Point: A growing body of archaeological evidence from multiple continents places humans in the Americas well before the Clovis horizon (~13,050–12,750 cal BP), decisively overturning the "Clovis First" model.
Key Evidence:
| Site | Location | Age | Evidence Type |
|---|---|---|---|
| Monte Verde | Chile | ~14,500–18,500 cal BP | Stone tools, faunal remains, burned areas |
| Cooper's Ferry | Idaho, USA | ~16,560–15,280 cal BP | Lithic assemblages |
| Gault Site | Texas, USA | ~16,000–20,000 BP (OSL) | Pre-Clovis projectile points |
| Page-Ladson | Florida, USA | ~14,550 cal BP | Stone tools, mastodon bones |
| Paisley Caves | Oregon, USA | >13,100 cal BP | Human fecal biomarkers, cut-marked bones |
| Chiquihuite Cave | Mexico | ~33,000–26,000 BP | Stone artefacts (contested) |
| Vale da Pedra Furada | Brazil | ~24,000 cal BP | Stone artefact |
| Bluefish Caves | Yukon, Canada | ~24,000 cal BP | Cut-marked bones |
Pre-Clovis human presence in North America is supported by alluvial sediment OSL dating at Gault Site, and human fecal biomarkers at Paisley Caves unequivocally identify human coprolites dating to pre-Clovis contexts (Shillito et al., 2020; TJ et al., 2018).
Interpretation: The convergence of diverse evidence types (lithics, biomarkers, faunal associations, chronometric dating) at geographically dispersed pre-Clovis sites makes the pre-Clovis occupation robust. However, the most extreme claims (>20,000 BP sites) remain methodologically contested.
Key Point: Multiple independent lines of evidence demonstrate that the inland Ice-Free Corridor (IFC) between the Laurentide and Cordilleran ice sheets was closed during the period of first entry, strongly favouring a Pacific coastal route.
Key Evidence:
- Cosmogenic nuclide (¹⁰Be) exposure ages show the IFC opened well after pre-Clovis occupation of the Americas; the corridor was blocked from ~26 to ~14 ka (J et al., 2022a; Praetorius et al., 2023).
- Bison radiocarbon and ancient mtDNA evidence confirms the IFC was closed from ~23,000 until 13,400 cal BP; first bison dispersal south through the corridor did not occur until after 13,400 cal BP (PD et al., 2016).
- Radiocarbon dates demonstrate the IFC "was not feasible as an early human migration route until after 11,000 BP" — after the appearance of Clovis south of the continental glaciers (Arnold, 2002).
- Cordilleran Ice Sheet maximum conditions in southeastern Alaska dated to ~20–17 ka, with coastal pathway open and ecologically viable after ~17 ka (AJ et al., 2018).
Interpretation: The IFC may have facilitated later dispersals (e.g., fluting technology spreading northward, Paleo-Eskimo movements) but cannot account for the first Americans. The Pacific coastal route is now the leading model for initial entry.
Key Point: Archaeological, palaeoclimatic, genomic, and archaeozoological evidence collectively support a kelp-highway coastal migration as the primary entry route for the founding population.
Key Evidence:
- Human footprints in a 13,000-year-old palaeosol on Calvert Island, British Columbia confirm Pacific coastal human presence (McLaren et al., 2018).
- Haplogroup D4h3 spread into the Americas via the Pacific coastal route, marking one of two distinct Paleo-Indian migration pathways from Beringia (Perego et al., 2009).
- An ancient dog from southeast Alaska dated to 10,150 ± 260 cal BP belongs to the precontact dog lineage that diverged from Siberian dogs ~16,700 years ago, consistent with early coastal dispersal (Coelho et al., 2021).
- Paleocoastal sites on California's Northern Channel Islands (CA-SRI-26, ~11,700 BP) document early maritime Paleoindian adaptations (JM et al., 2020).
- Mitogenomic data support an early Paleo-Indian movement from North America to Ecuador/Peru within ~1.5 ka, between 16.0 and 14.6 ka (Brandini et al., 2017).
- "Two entry routes separated by the Andes and Amazon rainforest facilitated initial Paleoindian settlement of South America" (Gómez‐Carballa et al., 2018).
Interpretation: The convergence of coastal deglaciation timing, coastal archaeological sites, and genetic lineages specific to the Pacific corridor provides a compelling case. Whether coastal migrants were exclusively by boat or could also travel on foot along exposed shorelines (now submerged) remains an open question requiring underwater archaeological investigation.
Key Point: Once south of the ice sheets, humans dispersed across the hemisphere with extraordinary speed, reaching the Southern Cone within roughly 1,500 years of first entry.
Key Evidence:
- Analysis of a screened radiocarbon database of >1,600 early dates estimates earliest human arrival in South America between 16,600 and 15,100 cal BP (mean ~15,500 cal BP) (Prates et al., 2020).
- By ~12,500 ¹⁴C years BP, humans had already reached the Southern Cone of South America (Politis et al., 2021).
- Hunter-gatherers occupied the Southern Cone at ~14,000 cal BP (Arroyo Seco 2 site), predating Clovis dispersal (Politis et al., 2016).
- A human footprint at Pilauco, northern Patagonia, is associated with megafauna bones and dated to the late Pleistocene (K et al., 2019).
- Y-chromosome haplogroup Q analysis confirms that "major phase of male population growth in the Americas occurred after 15 kya" (Achilli et al., 2019).
Interpretation: The rapidity of hemispheric spread — if not attributed entirely to coastal migration — implies either very small founding populations moving quickly along rich coastal resources, or multiple simultaneous entry points. This speed also has direct implications for models of megafaunal extinction.
Key Point: Evidence for the number of distinct founding migration waves is genuinely contested, with credible data supporting anywhere from one to four or more events.
Key Evidence:
- Whole-genome data indicate "most Native Americans descend entirely from a single ancestral 'First American' population" (Kitchen et al., 2012), but the same study identifies at least three streams of Asian gene flow.
- Dulik et al. (2012) documents two separate post-initial colonization population expansions forming Eskimoan and Athapaskan groups based on Y-chromosome data.
- Ancient genomic data from 49 individuals across the hemisphere show all South American ancient individuals derive from one of two early branches that contributed to Native Americans (C et al., 2018).
- Linguistic evidence supports two population strata from coastal entries ~24,000 and ~15,000 years ago, with an inland entry beginning ~14,000 years ago (J, 2025).
- At least four distinct streams of Eurasian migration are identified in present-day and prehistoric Native American populations (Skoglund & Reich, 2016).
The apparent conflict between "single wave" and "multiple wave" models may partly reflect different questions being asked — most Native American ancestry derives from a single first migration, but subsequent distinct migration events (Paleo-Eskimo, Na-Dene ancestors) are also well-documented and are not mutually exclusive with a primary founding event.
Key Point: A statistically robust Australasian genetic signal detected in some Amazonian and Pacific coastal South American populations remains unexplained and represents one of the most significant unresolved questions in the field.
Key Evidence:
- "Australasian genetic signal is present in the Pacific coast region of South America, indicating widespread distribution" and "was introduced into South America via the Pacific coastal route" (Silva et al., 2021).
- This signal appears in populations from coastal Pacific and Amazonian regions but is absent or weak in Andean and other groups.
- No Australasian skeletons have been found in the Americas; the signal may reflect a diverged East Asian population not yet sampled, rather than a literal transoceanic migration.
Interpretation: This finding, if confirmed by future ancient DNA from relevant populations, would demand substantial revision of current peopling models. It is currently one of the most active areas of investigation.
Key Point: Historical linguistics independently supports recent colonization from Asia via Beringia, with language phylogenies pointing to a Beringian radiation rather than a central Asian origin.
Key Evidence:
- Dene-Yeniseian linguistic connection more likely reflects "radiation out of Beringia with back-migration into central Asia," not a central Asian origin (MA & G, 2014).
- Linguistic founder effects support two coastal entry strata (~24,000 and ~15,000 BP) plus an inland entry (~14,000 BP) (J, 2025).
- Nettle (1999) demonstrates that linguistic stock diversity in the Americas is consistent with a recent colonization, contradicting earlier estimates of ~35,000 BP based on Nichols' (1990) linear diversity model.
- Holman et al. (2011) automated language dating methods provide corroborating chronological scaffolding for divergence times.
Interpretation: Linguistic data provide an independent and convergent line of evidence. However, the high diversity of American language families and the deep time involved make precise linguistic dating of initial colonization inherently uncertain.
The following table summarises the principal areas of active disagreement in the literature:
| Claim | Position A | Key Papers | Position B | Key Papers | Evidence Strength |
|---|---|---|---|---|---|
| Timing of first entry | ~16,000–14,600 cal BP (post-LGM) | Potter et al. (2021); BA et al. (2018); Waters (2019) | >20,000 BP (pre-LGM or during LGM) | Ardelean et al. (2020); Bourgeon et al. (2017); E et al. (2021); Cabrera (2025) | Moderate–high for post-LGM; low–moderate for pre-LGM |
| Primary migration route | Pacific coastal route | AJ et al. (2018); McLaren et al. (2018); J et al. (2022a) | Ice-Free Corridor (secondary/later role) | Arnold (2002); HL & T (2018); Kashani et al. (2012) | Strong for coastal; IFC plausible only for post-14,000 BP dispersals |
| Number of founding waves | Single founding population | Raghavan et al. (2015); Llamas et al. (2016); SL & FM (1997) | Multiple waves (2–4+) | Kitchen et al. (2012); Skoglund & Reich (2016); Dulik et al. (2012) | Consistent with single primary wave + later distinct migrations |
| Validity of extreme pre-Clovis sites (>20,000 BP) | Valid evidence of pre-LGM occupation | Ardelean et al. (2020); Bourgeon et al. (2017); E et al. (2021) | Equivocal/unsubstantiated | Potter et al. (2021); TA et al. (2022) | Low–moderate; stratigraphic integrity disputed |
| Solutrean/Atlantic hypothesis | Some West Eurasian contribution | Bradley et al. (2014); Yuan & Huang (2017) | No credible Atlantic route | Mulligan et al. (2004); Goebel et al. (2008); majority of genetic studies | Very low; nearly universally rejected |
| Australasian signal source | Real distinct migration event | Silva et al. (2021) | Statistical artefact or unsampled Asian source population | Most genomic studies (implicit) | Uncertain; requires ancient DNA resolution |
| Craniofacial diversity: one or two waves | Two morphological waves (Paleoamerican + Mongoloid) | Hübbe et al. (2010); N et al. (2017) | Single wave with in situ diversification | González‐José et al. (2008); Strauss (2016); Alsup (2012) | Moderate; depends on analytical method |
| Method | Associated Finding | Paper Count | Confidence |
|---|---|---|---|
| AMS radiocarbon / OSL chronometry | Pre-Clovis occupation at multiple sites | ~72 papers | High |
| Ancient DNA (whole genome) | Single primary founding wave; Beringian standstill confirmed | ~58 papers | High |
| Modern population genomics | ≥3 streams of Asian gene flow; post-contact population collapse | ~55 papers | High |
| Lithic technological analysis | Pre-Clovis assemblages distinct from Clovis; NE Asian parallels | ~38 papers | Moderate–high |
| Cosmogenic nuclide dating (¹⁰Be) | IFC unavailable before ~14,000 BP | 3+ papers | High |
| mtDNA haplogroup phylogenetics | Beringian founding; coastal route marked by D4h3 | 30+ papers | High |
| Y-chromosome SNP/haplogroup analysis | 3–4 founding male lineages; short Beringian standstill | 12+ papers | High |
| Craniometric/geometric morphometrics | Two morphological waves vs. single wave (contested) | 10+ papers | Moderate |
| Comparative linguistic phylogenetics | Beringian radiation; recent colonisation consistent with genetics | 8 papers | Moderate |
| Archaeozoology / stable isotopes | Coastal subsistence; rapid inland spread post-entry | 8+ papers | Moderate |
Of the 205 papers with credibility data, the tier distribution is as follows:
| Tier | Count | % | Common Strengths | Common Weaknesses |
|---|---|---|---|---|
| High | 17 | 8% | Large samples; replicated findings; multi-site; transparent methods | — |
| Medium | 142 | 69% | Appropriate methods; transparent limitations | Weak methodology sections; no data availability statements |
| Low | 43 | 21% | — | Small samples; overclaimed findings; no code availability |
| Uncertain | 3 | 1% | — | Insufficient information for assessment |
The mean overall credibility score across papers is 0.50, reflecting a predominantly medium-tier evidence base. High-credibility papers include landmark ancient genomics studies (Raghavan et al., 2015; Moreno-Mayar et al., 2018; C et al., 2018), major radiocarbon chronometry efforts (Prates et al., 2020), and well-replicated genetic analyses (Pinotti et al., 2018; Llamas et al., 2016).
Notable high-credibility examples:
- Raghavan et al. (2015): Large-scale whole-genome sequencing; results replicated across multiple subsequent studies.
- C et al. (2018): 49 ancient genomes; multi-site; rigorous authentication.
- Moreno-Mayar et al. (2018): 15 ancient genomes spanning Alaska to Patagonia; up to 18× coverage.
Formal verbatim quote grounding was not available for this analysis (grounding pipeline returned 0 verified quotes from the automated extraction stage). All inline quotes in this report are drawn directly from key claims as reported in the papers' abstracts and results sections, as provided in the structured data. Readers should consult original publications to verify specific wording.
Cross-validation identified 20 medium-severity issues and no high-severity issues. Common medium-severity concerns include:
None of the flagged issues involve data fabrication, retraction, or fundamental methodological error sufficient to overturn major conclusions.
| Stage | Count |
|---|---|
| Initial discovery (7 databases) | 938 papers |
| Passed screening (gate pass) | 273 |
| Failed screening (gate fail) | 605 |
| Flagged for review | 60 |
| Entered extraction pipeline | 324 |
| Classified | 266 |
| Results extractable | 266 |
| Results analysable | 212 |
Databases searched: Semantic Scholar, Crossref, OpenAlex, PubMed, Europe PMC, CORE, DOAJ
Date range: 1990–2026
Query themes: Peopling of the Americas, Paleoindian colonisation, pre-Clovis sites, Beringia dispersal, ancient genomics, coastal migration, ice-free corridor, Clovis culture, Monte Verde, ancient DNA, linguistic phylogeny, mtDNA haplogroups, Y-chromosome migration, whole-genome sequencing, Siberian ancestry, Pleistocene megafauna.
Included: Papers presenting primary archaeological, genetic, or linguistic data on the timing, routes, or source populations of initial colonisation; radiocarbon dates, genomic analyses, phylogenetic reconstructions, or systematic artefact analyses; peer-reviewed empirical studies, reviews, or theoretical papers engaging with specific colonisation evidence; human skeletal remains, ancient DNA, lithic assemblages, faunal associations, or linguistic reconstructions dated ca. 30,000–8,000 BP.
Excluded: Papers focused exclusively on post-Holocene cultural developments; Mesoamerican/Andean state-level civilisations without colonisation links; purely methodological papers without Americas application; historical period (post-1492) populations only; non-peer-reviewed popular science; non-human palaeontology without direct human presence reference; duplicate or retracted studies; Old World prehistory without direct Americas link.
This meta-analysis is based on 212 analysable papers from a pool of 938 discovered, imposing limits on comprehensiveness.
Missing populations and regions:
- Underwater/submerged coastal archaeological sites (likely containing key early coastal evidence) are almost entirely absent from the literature reviewed.
- Interior South American populations (particularly central Brazil and western Amazonia) are underrepresented in ancient genomic studies.
- Northeast Siberian populations ancestral to Native Americans remain incompletely sampled in ancient DNA studies.
Methodological gaps:
- Formal verbatim evidence grounding could not be completed (0 grounded claims), meaning quote accuracy relies on author-reported claim summaries.
- Craniometric and morphological studies use heterogeneous analytical frameworks (2D vs. 3D geometric morphometrics, R-matrix, Mantel tests), making direct comparison difficult.
- Radiocarbon dating of bone collagen is susceptible to contamination at some pre-Clovis sites, and OSL dates carry wide uncertainties.
Biases:
- Publication bias: Positive findings (confirmed pre-Clovis occupation, novel genetic signals) are more likely to be published than null results.
- Language bias: Search included English, Spanish, Portuguese, and French, but grey literature and non-Anglophone dissertations may be underrepresented.
- Database bias: Seven databases were searched, but specialised South American and East Asian archaeological databases may have been missed.
What this analysis cannot conclude:
- The exact number of individuals in the founding population (estimates range from <80 to several hundred effective individuals).
- Whether any transoceanic contact (Polynesian, Atlantic) contributed meaningfully to early American genetics — the Australasian signal requires direct ancient DNA resolution.
- The subsistence ecology and precise routes of the first coastal migrants (submerged landscape archaeology needed).
As noted in the Evidence Grounding section, the automated grounding pipeline returned no formally validated verbatim quotes from source texts. The table below lists the most important claims as extracted from paper abstracts/results in the structured data, which formed the evidentiary basis for this report. These should be verified against original publications.
| Paper | Key Claim | Source Section | Confidence |
|---|---|---|---|
| Raghavan et al. (2015) | All present-day Native Americans descend from a single migration wave from Siberia no earlier than 23 ka; up to 8,000-year Beringian isolation | Results | High |
| Pinotti et al. (2018) | 3–4 independent Y-chromosome founding lineages; Beringian Standstill 2.7–4.6 ky; entry south of ice sheet after 19.5 kya | Results | High |
| Llamas et al. (2016) | Small founding population entered Americas via coastal route ~16.0 ka; isolated 2.4–9 ky in eastern Beringia | Results | High |
| C et al. (2018) | 49 ancient genomes; all South American ancient individuals derive from one of two early branches | Results | High |
| Moreno-Mayar et al. (2018) | 15 ancient genomes spanning Alaska to Patagonia; all most closely related to Native Americans | Results | High |
| J et al. (2022a) | Cosmogenic nuclide ages show IFC opened well after pre-Clovis occupation; supports coastal route | Results | High |
| PD et al. (2016) | IFC closed from ~23,000 until 13,400 cal BP based on bison radiocarbon and ancient mtDNA | Results | High |
| AJ et al. (2018) | Coastal pathway through SE Alaska open and ecologically viable after 17 ka | Results | High |
| TJ et al. (2018) | Gault Site OSL ages ~16,000–20,000 BP; pre-Clovis projectile point technology | Results | High |
| Ardelean et al. (2020) | Chiquihuite Cave yields cultural evidence possibly dating to 33,000–31,000 BP | Results | Moderate |
| Bourgeon et al. (2017) | Bluefish Caves occupied as early as 24,000 cal BP; cut-marked bone dated 19,650 ± 130 ¹⁴C BP | Results | Moderate |
| Prates et al. (2020) | Earliest South American arrival 16,600–15,100 cal BP based on >1,600 radiocarbon dates | Results | High |
| Achilli et al. (2008) | Pan-American haplogroups A2, B2, C1, D1 trace to six founder haplotypes; coalescence ~19,000 BP | Results | High |
| SD & JC (2022) | Native Americans harbour 20,424 unique Beringian alleles | Results | High |
| Silva et al. (2021) | Australasian ancestry introduced into South America via Pacific coastal route | Results | Moderate |
| J (2025) | Linguistic founder effects support two coastal entry strata (~24,000 and ~15,000 BP) | Results | Moderate |
| MA & G (2014) | Dene-Yeniseian connection reflects radiation out of Beringia, not central Asian origin | Results | Moderate |
| Potter et al. (2021) | Current data strongly support entry after 16,000 cal BP; purported pre-Paleoindian sites are equivocal | Review | Moderate |
| Wang et al. (2007) | Genetic diversity decreases with geographic distance from Bering Strait | Results | High |
| DB et al. (2025) | Pre-13,500 cal BP North American sites share lithic tradition with NE Asian Late Upper Paleolithic | Results | High |
Achilli, A., Perego, U. A., Bravi, C. M., et al. (2008). The phylogeny of the four pan-American mtDNA haplogroups: Implications for evolutionary and disease studies. PLoS ONE. https://doi.org/10.1371/journal.pone.0001764
Achilli, A., Perego, U. A., Lancioni, H., et al. (2013a). Reconciling migration models to the Americas with the variation of North American native mitogenomes. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1306290110
Achilli, A., Acuna-Alonzo, V., Bolnick, D., et al. (2013b). Brief communication: Evolution of a specific O allele (O1vG542A) supports unique ancestry of Native Americans. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.22292
Achilli, A., Brandstätter, A., et al. (2015). Demographic history of indigenous populations in Mesoamerica based on mtDNA sequence data. PLoS ONE. https://doi.org/10.1371/journal.pone.0131791
Achilli, A., Battaglia, V., Capodiferro, M. R., et al. (2019). Analysis of the human Y-chromosome haplogroup Q characterizes ancient population movements in Eurasia and the Americas. BMC Biology. https://doi.org/10.1186/s12915-018-0622-4
Anderson, D. G., & Gillam, J. C. (2000). Paleoindian colonization of the Americas: Implications from an examination of physiography, demography, and artifact distribution. American Antiquity. https://doi.org/10.2307/2694807
Aqil, A., Gill, S., & Gokcumen, O. (2023). A paleogenome from a Holocene individual supports genetic continuity in Southeast Alaska. iScience. https://doi.org/10.1016/j.isci.2023.106581
Arango-Isaza, E., Capodiferro, M. R., Aninao, M. J., et al. (2023). The genetic history of the Southern Andes from present-day Mapuche ancestry. Current Biology. https://doi.org/10.1016/j.cub.2023.05.013
Ardelean, C. F. (2013). Archaeology of early human occupations and the Pleistocene-Holocene transition in the Zacatecas Desert, Northern Mexico. Society for American Archaeology.
Ardelean, C. F., Becerra-Valdivia, L., Pedersen, M. W., et al. (2020). Evidence of human occupation in Mexico around the Last Glacial Maximum. Nature. https://doi.org/10.1038/s41586-020-2509-0
Arnaiz-Villena, A., Parga-Lozano, C., Moreno, E., et al. (2010). The origin of Amerindians and the peopling of the Americas according to HLA genes. Current Genomics. https://doi.org/10.2174/138920210790886862
Arnold, T. G. (2002). Radiocarbon dates from the Ice-Free Corridor. Radiocarbon. https://doi.org/10.1017/s0033822200031829
Ayub, Q., Bawn, M., Bergström, A., et al. (2018). Y chromosome sequences reveal a short Beringian standstill, rapid expansion, and early population structure of Native American founders. Elsevier Ltd.
Azevedo, S. de, Nocera, A. C., Paschetta, C., et al. (2011). Evaluating microevolutionary models for the early settlement of the New World: The importance of recurrent gene flow with Asia. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.21564
Bailly, P., Bégat, C., Chiaroni, J., et al. (2015). Revisiting the Diego blood group system in Amerindians: Evidence for gene-culture comigration. PLoS ONE. https://doi.org/10.1371/journal.pone.0132211
Battaglia, V., Grugni, V., Perego, U. A., et al. (2013). The first peopling of South America: New evidence from Y-chromosome haplogroup Q. PLoS ONE. https://doi.org/10.1371/journal.pgen.1003460
Bedoya, G., Burchard, E. G., Bustamante, C. D., et al. (2019). Reconstructing Native American migrations from whole-genome and whole-exome data. PLoS Genetics.
Bigelow, N., Elias, S., & Hoffecker, J. (2016). Beringia and the global dispersal of modern humans. Wiley. https://doi.org/10.1002/evan.21478
Bodner, M., Perego, U. A., Huber, G., et al. (2012). Rapid coastal spread of First Americans: Novel insights from South America's Southern Cone mitochondrial genomes. Genome Research. https://doi.org/10.1101/gr.131722.111
Bolnick, D. A. (2006). Asymmetric male and female genetic histories among Native Americans from eastern North America. Molecular Biology and Evolution. https://doi.org/10.1093/molbev/msl088
Bonomo, M., Gonzalez, M., & Menéndez, L. P. (2021). Early Holocene human remains from the Argentinean Pampas: Cranial variation in South America and the American peopling. PaleoAmerica.
Bourgeon, L., Burke, A., & Higham, T. (2017). Earliest human presence in North America dated to the Last Glacial Maximum: New radiocarbon dates from Bluefish Caves, Canada. PLoS ONE. https://doi.org/10.1371/journal.pone.0169486
Bradley, B. A., Oppenheimer, S., & Stanford, D. J. (2014). Solutrean hypothesis: Genetics, the mammoth in the room. Informa UK Limited. https://doi.org/10.1080/00438243.2014.966273
Brandini, S., Bergamaschi, P., Cerna, M., et al. (2017). The Paleo-Indian entry into South America according to mitogenomes. Molecular Biology and Evolution. https://doi.org/10.1093/molbev/msx267
Burchard, E. G., Bustamante, C. D., & Eng, C. (2020). Population history and gene divergence in Native Mexicans inferred from 76 human exomes. eScholarship, University of California.
Buvit, I., & Graf, K. E. (2017). Human dispersal from Siberia to Beringia: Assessing a Beringian Standstill in light of the archaeological evidence. ScholarWorks@CWU.
Cabrera, V. M. (2025). What uniparental genes tell us about the prehistoric human colonization of the Americas. https://doi.org/10.1101/2025.08.04.668419
Capodiferro, M. R., Aram, B., Raveane, A., et al. (2021). Archaeogenomic distinctiveness of the Isthmo-Colombian area. Cell. https://doi.org/10.1016/j.cell.2021.02.040
Castro, C. de la F., Ávila-Arcos, M. C., Galimany, J., et al. (2018). Genomic insights into the origin and diversification of late maritime hunter-gatherers from the Chilean Patagonia. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1715688115
Chatters, J. C., Potter, B. A., & Fiedel, S. J. (2024). Mammoth featured heavily in Western Clovis diet. Science Advances. https://doi.org/10.1126/sciadv.adr3814
Clark, J., Carlson, A. E., & Reyes, A. V. (2022). The age of the opening of the Ice-Free Corridor and implications for the peopling of the Americas. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.2118558119
Coelho, F. A. da S., Gill, S., Tomlin, C. M., et al. (2021). An early dog from southeast Alaska supports a coastal route for the first dog migration into the Americas. Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2020.3103
Colombo, G., Traverso, L., Mazzocchi, L., et al. (2022). Overview of the Americas' first peopling from a patrilineal perspective: New evidence from the Southern Continent. Genes. https://doi.org/10.3390/genes13020220
Consortium (1000 Genomes Project), et al. (2013). Reconstructing Native American migrations from whole-genome and whole-exome data. PLoS Genetics. https://doi.org/10.1371/journal.pgen.1004023
Crawford, M., & Rubicz, R. C. (2016). Molecular genetic evidence from contemporary populations for the origins of Native North Americans. Oxford Handbooks Online. https://doi.org/10.1093/oxfordhb/9780199766956.013.4
Darvill, C. M., Menounos, B., & Goehring, B. M. (2018). Retreat of the Western Cordilleran Ice Sheet margin during the last deglaciation. Geophysical Research Letters. https://doi.org/10.1029/2018gl079419
Davis, L. G., Madsen, D. B., Becerra-Valdivia, L., et al. (2019). Late Upper Paleolithic occupation at Cooper's Ferry, Idaho, USA, ~16,000 years ago. Science. https://doi.org/10.1126/science.aax9830
Delgado Burbano, M. E. (2021). Holocene population history of the Sabana de Bogotá region, Northern South America. American Journal of Physical Anthropology.
Díaz-Matallana, M., Gómez, A., & Briceño, I. (2016). Genetic analysis of paleo-Colombians from Nemocón, Cundinamarca provides insights on the early peopling of northwestern South America. Revista de la Academia Colombiana de Ciencias. https://doi.org/10.18257/raccefyn.328
Dickinson, W. R. (2011). Geological perspectives on the Monte Verde archeological site in Chile and pre-Clovis coastal migration in the Americas. Quaternary Research. https://doi.org/10.1016/j.yqres.2011.06.011
Dillehay, T. D., & Collins, M. B. (1991). Monte Verde, Chile: A comment on Lynch. American Antiquity. https://doi.org/10.2307/281422
Dillehay, T. D., Ocampo, C., Saavedra, J., et al. (2015). New archaeological evidence for an early human presence at Monte Verde, Chile. PLoS ONE. https://doi.org/10.1371/journal.pone.0141923
Domínguez-Rodrigo, M., Baquedano, E., & Varela, L. (2021). Deep classification of cut-marks on bones from Arroyo del Vizcaíno (Uruguay). Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2021.0710
Dryomov, S. V., Nazhmidenova, A. M., & Starikovskaya, E. B. (2021). Mitochondrial genome diversity on the Central Siberian Plateau with particular reference to the prehistory of northernmost Eurasia. PLoS ONE. https://doi.org/10.1371/journal.pone.0244228
Dulik, M. C., Owings, A. C., Gaieski, J. B., et al. (2012). Y-chromosome analysis reveals genetic divergence and new founding native lineages in Athapaskan- and Eskimoan-speaking populations. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1118760109
Erickson, R. P. (2021). Autosomal recessive diseases among the Athabaskans of the southwestern United States. Journal of Applied Genetics. https://doi.org/10.1007/s13353-021-00630-7
Erlandson, J. M., Braje, T. J., Ainis, A. F., et al. (2020). Maritime Paleoindian technology, subsistence, and ecology at an ~11,700 year old Paleocoastal site on California's Northern Channel Islands. PLoS ONE. https://doi.org/10.1371/journal.pone.0238866
Fehren-Schmitz, L., Llamas, B., Lindauer, S., et al. (2015). A re-appraisal of the early Andean human remains from Lauricocha in Peru. PLoS ONE. https://doi.org/10.1371/journal.pone.0127141
Ferraz, T., Villagran, X. S., Nägele, K., et al. (2023). Genomic history of coastal societies from eastern South America. Nature Ecology & Evolution. https://doi.org/10.1038/s41559-023-02114-9
Fix, A. G. (2005). Rapid deployment of the five founding Amerind mtDNA haplogroups via coastal and riverine colonization. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.20230
Flegontov, P., Changmai, P., Zidkova, A., et al. (2016). Genomic study of the Ket: A Paleo-Eskimo-related ethnic group with significant ancient North Eurasian ancestry. Scientific Reports. https://doi.org/10.1038/srep20768
Forster, P., Torroni, A., & Renfrew, C. (2001). Phylogenetic star contraction applied to Asian and Papuan mtDNA evolution. Molecular Biology and Evolution. https://doi.org/10.1093/oxfordjournals.molbev.a003728
García-Ortiz, H., Barajas-Olmos, F., Contreras-Cubas, C., et al. (2021). The genomic landscape of Mexican Indigenous populations brings insights into the peopling of the Americas. Nature Communications. https://doi.org/10.1038/s41467-021-26188-w
George, D., Southon, J., & Taylor, R. E. (2005). Resolving an anomolous radiocarbon determination on mastodon bone from Monte Verde, Chile. American Antiquity. https://doi.org/10.2307/40035873
Goebel, T., Waters, M. R., & O'Rourke, D. H. (2008). The Late Pleistocene dispersal of modern humans in the Americas. Science. https://doi.org/10.1126/science.1153569
Gómez-Carballa, A., Pardo-Seco, J., Brandini, S., et al. (2018). The peopling of South America and the trans-Andean gene flow of the first settlers. Genome Research. https://doi.org/10.1101/gr.234674.118
Gómez, R., Vilar, M. G., & Meraz-Ríos, M. A. (2021). Y chromosome diversity in Aztlan descendants and its implications for the history of Central Mexico. iScience. https://doi.org/10.1016/j.isci.2021.102487
González-José, R., García-Moro, C., & Dahinten, S. L. (2002). Origin of Fueguian-Patagonians: An approach to population history and structure using R matrix and matrix permutation methods. American Journal of Human Biology. https://doi.org/10.1002/ajhb.10033
González-José, R., Bortolini, M. C., & Santos, F. R. (2008). The peopling of America: Craniofacial shape variation on a continental scale and its interpretation from an interdisciplinary view. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.20854
Goodyear, A. C. (2005). Evidence of pre-Clovis sites in the eastern United States. Scholar Commons.
Goodyear, A. C., & Sain, D. A. (2018). The pre-Clovis occupation of the Topper site, Allendale County, South Carolina. In Early Human Life on the Southeastern Coastal Plain. https://doi.org/10.5744/florida/9781683400349.003.0002
Guio, H., Sanchez, C., & Borda, V. (2025). The Peruvian genome project: Expanding the global pool of genome diversity from South America. Frontiers in Genetics. https://doi.org/10.3389/fgene.2025.1614021
Halligan, J. J., Waters, M. R., & Perrotti, A. (2016). Pre-Clovis occupation 14,550 years ago at the Page-Ladson site, Florida, and the peopling of the Americas. Science Advances. https://doi.org/10.1126/sciadv.1600375
Halffman, C. M., Potter, B. A., & McKinney, H. J. (2015). Early human use of anadromous salmon in North America at 11,500 y ago. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1509747112
Halffman, C. M., Potter, B. A., & McKinney, H. J. (2020). Ancient Beringian paleodiets revealed through multiproxy stable isotope analyses. Science Advances. https://doi.org/10.1126/sciadv.abc1968
He, Y. (2026). Reassessing the transoceanic drift hypothesis for bottle gourd dispersal to the Americas. https://doi.org/10.2139/ssrn.6168326
Heintzman, P. D., Froese, D., & Ives, J. W. (2016). Bison phylogeography constrains dispersal and viability of the Ice Free Corridor in western Canada. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1601077113
Hey, J. (2005). On the number of New World founders: A population genetic portrait of the peopling of the Americas. PLoS Biology. https://doi.org/10.1371/journal.pbio.0030193
Hockett, B., & Jenkins, D. L. (2013). Identifying stone tool cut marks and the pre-Clovis occupation of the Paisley Caves. American Antiquity. https://doi.org/10.7183/0002-7316.78.4.762
Hoffecker, J. F., Pitulko, V. V., & Pavlova, E. A. (2022). Beringia and the settlement of the Western Hemisphere. Vestnik of Saint Petersburg University History. https://doi.org/10.21638/spbu02.2022.313
Hoffecker, J. F., Elias, S. A., & Scott, G. R. (2023). Beringia and the peopling of the Western Hemisphere. Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2022.2246
Holman, E. W., Brown, C. H., & Wichmann, S. (2011). Automated dating of the world's language families based on lexical similarity. Current Anthropology. https://doi.org/10.1086/662127
Hübbe, M., Neves, W. A., & Harvati, K. (2010). Testing evolutionary and dispersion scenarios for the settlement of the New World. PLoS ONE. https://doi.org/10.1371/journal.pone.0011105
Hübbe, M., Strauss, A., & Hubbe, A. (2015). Early South Americans cranial morphological variation and the origin of American biological diversity. PLoS ONE. https://doi.org/10.1371/journal.pone.0138090
Hubbe, M., Terrazas Mata, A., & Herrera, B. (2020). Morphological variation of the early human remains from Quintana Roo, Yucatán Peninsula, Mexico. PLoS ONE. https://doi.org/10.1371/journal.pone.0227444
Iriarte, J., Ziegler, M. J., & Outram, A. K. (2022). Ice Age megafauna rock art in the Colombian Amazon? Philosophical Transactions of the Royal Society B. https://doi.org/10.1098/rstb.2020.0496
Kashani, B. H., Perego, U. A., Olivieri, A., et al. (2012). Mitochondrial haplogroup C4c: A rare lineage entering America through the ice-free corridor? American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.21614
Keyeux, G., Rodas, C., & Gélvez, N. (2002). Possible migration routes into South America deduced from mitochondrial DNA studies in Colombian Amerindian populations. Human Biology. https://doi.org/10.1353/hub.2002.0022
King, M. (2012). The distribution of Paleoindian debitage from the Pleistocene terrace at the Topper site. TRACE: Tennessee Research and Creative Exchange.
King, M. M. (2016). The distribution of Paleoindian debitage from the Pleistocene terrace at the Topper site (revised). Scholar Commons.
Kitchen, A., Miyamoto, M. M., & Mulligan, C. J. (2008). A three-stage colonization model for the peopling of the Americas. PLoS ONE. https://doi.org/10.1371/journal.pone.0001596
Kitchen, A., Price, A. L., & Contreras, A. V. (2012). Reconstructing Native American population history. Nature. https://doi.org/10.1038/nature11258
Kocher, A., Papac, L., Barquera, R., et al. (2021). Ten millennia of hepatitis B virus evolution. Science. https://doi.org/10.1126/science.abi5658
Kumar, S., Bellis, C., Zlojutro, M., et al. (2011). Large scale mitochondrial sequencing in Mexican Americans suggests a reappraisal of Native American origins. BMC Evolutionary Biology. https://doi.org/10.1186/1471-2148-11-293
Lahr, M. M. (1995). Patterns of modern human diversification: Implications for Amerindian origins. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.1330380609
Lalueza-Fox, C., Luna Calderón, F., & Calafell, F. (2001). MtDNA from extinct Tainos and the peopling of the Caribbean. Annals of Human Genetics. https://doi.org/10.1046/j.1469-1809.2001.6520137.x
Lanoë, F., Reuther, J., & Fields, S. (2024). Late Pleistocene onset of mutualistic human/canid relationships in subarctic Alaska. Science Advances. https://doi.org/10.1126/sciadv.ads1335
Lee, E. J., & Merriwether, D. A. (2015). Identification of whole mitochondrial genomes from Venezuela and implications on regional phylogenies in South America. Human Biology. https://doi.org/10.13110/humanbiology.87.1.0029
Lesnek, A. J., Briner, J. P., & Lindqvist, C. (2018). Deglaciation of the Pacific coastal corridor directly preceded the human colonization of the Americas. Science Advances. https://doi.org/10.1126/sciadv.aar5040
Lindo, J., Achilli, A., Perego, U. A., et al. (2016). Ancient individuals from the North American Northwest Coast reveal 10,000 years of regional genetic continuity. bioRxiv. https://doi.org/10.1101/093468
Lindo, J., Achilli, A., Perego, U. A., et al. (2017). Ancient individuals from the North American Northwest Coast reveal 10,000 years of regional genetic continuity. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1620410114
Llamas, B., Fehren-Schmitz, L., & Valverde, G. (2016). Ancient mitochondrial DNA provides high-resolution time scale of the peopling of the Americas. Science Advances. https://doi.org/10.1126/sciadv.1501385
Luis, J. R., Palencia-Madrid, L., & Garcia-Bertrand, R. (2023). Bidirectional dispersals during the peopling of the North American Arctic. Scientific Reports. https://doi.org/10.1038/s41598-023-28384-8
Madsen, D. B., Davis, L. G., & Williams, T. J. (2025). Characterizing the American Upper Paleolithic. Science Advances. https://doi.org/10.1126/sciadv.ady9545
Malhi, R. S., Cybulski, J. S., & Tito, R. Y. (2010). Brief communication: Mitochondrial haplotype C4c confirmed as a founding genome in the Americas. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.21238
Mallick, S., Li, H., & Lipson, M. (2016). The Simons Genome Diversity Project: 300 genomes from 142 diverse populations. Nature. https://doi.org/10.1038/nature18964
Malyarchuk, B. A. (2023). The role of Beringia in human adaptation to Arctic conditions based on results of genomic studies of modern and ancient populations. Vavilovskii Zhurnal Genetiki i Selektsii. https://doi.org/10.18699/vjgb-23-45
Manin, A., Debruyne, R., Lin, A., et al. (2025). Ancient dog mitogenomes support the dual dispersal of dogs and agriculture into South America. Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2024.2443
McLaren, D., Fedje, D., & Dyck, A. (2018). Terminal Pleistocene epoch human footprints from the Pacific coast of Canada. PLoS ONE. https://doi.org/10.1371/journal.pone.0193522
Meiri, M., Lister, A. M., & Collins, M. J. (2013). Faunal record identifies Bering isthmus conditions as constraint to end-Pleistocene migration to the New World. Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2013.2167
Menéndez, L. P., Pérez, S. I., & Pucciarelli, H. M. (2015). Early Holocene human remains from the Argentinean Pampas: Cranial variation in South America and the American peopling. PaleoAmerica. https://doi.org/10.1179/2055556315z.00000000031
Mesa, N. R., Mondragón, M. C., & Soto, I. D. (2000). Autosomal, mtDNA, and Y-chromosome diversity in Amerinds: Pre- and post-Columbian patterns of gene flow in South America. American Journal of Human Genetics. https://doi.org/10.1016/S0002-9297(07)62955-3
Moreno, K., Bostelmann, J. E., & Macías, C. (2019). A late Pleistocene human footprint from the Pilauco archaeological site, northern Patagonia, Chile. PLoS ONE. https://doi.org/10.1371/journal.pone.0213572
Moreno-Mayar, J. V., Vinner, L., de Barros Damgaard, P., et al. (2018). Early human dispersals within the Americas. Science. https://doi.org/10.1126/science.aav2621
Moreno-Mayar, J. V., Sousa da Mota, B., & Higham, T. (2024). Ancient Rapanui genomes reveal resilience and pre-European contact with the Americas. Nature. https://doi.org/10.1038/s41586-024-07881-4
Motti, J. M. B., Pauro, M., & Scabuzzo, C. (2023). Ancient mitogenomes from the Southern Pampas of Argentina reflect local differentiation and limited extra-regional linkages after rapid initial colonization. American Journal of Biological Anthropology. https://doi.org/10.1002/ajpa.24727
Mulligan, C. J., Hunley, K., & Cole, S. (2004). Population genetics, history, and health patterns in Native Americans. Annual Review of Genomics and Human Genetics. https://doi.org/10.1146/annurev.genom.5.061903.175920
Nägele, K., Posth, C., Iraeta Orbegozo, M., et al. (2020). Genomic insights into the early peopling of the Caribbean. Science. https://doi.org/10.1126/science.aba8697
Nakatsuka, N., Holguin, B., & Sedig, J. (2023). Genetic continuity and change among the Indigenous peoples of California. Nature. https://doi.org/10.1038/s41586-023-06771-5
Nei, M., & Roychoudhury, A. K. (1993). Evolutionary relationships of human populations on a global scale. Molecular Biology and Evolution. https://doi.org/10.1093/oxfordjournals.molbev.a040059
Nettle, D. (1999). Linguistic diversity of the Americas can be reconciled with a recent colonization. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.96.6.3325
Nichols, J. (2025). Founder effects identify languages of the earliest Americans. American Journal of Biological Anthropology. https://doi.org/10.1002/ajpa.24923
Niedbalski, S. D., & Long, J. C. (2022). Novel alleles gained during the Beringian isolation period. Scientific Reports. https://doi.org/10.1038/s41598-022-08212-1
Núñez Castillo, M. I. (2021). Ancient genetic landscape of archaeological human remains from Panama, South America and Oceania described through STR genotype frequencies and mitochondrial DNA sequences. University of Göttingen Repository. https://doi.org/10.53846/goediss-9012
Pacheco, C., Stronen, A. V., Jędrzejewska, B., et al. (2022). Demography and evolutionary history of grey wolf populations around the Bering Strait. Molecular Ecology. https://doi.org/10.1111/mec.16613
Pansani, T. R., Pobiner, B., & Gueriau, P. (2023). Evidence of artefacts made of giant sloth bones in central Brazil around the last glacial maximum. Proceedings of the Royal Society B. https://doi.org/10.1098/rspb.2023.0316
Patiño, D. U., Collins, A., & Romero García, O. J. (2023). High mitochondrial haplotype diversity found in three pre-Hispanic groups from Colombia. Genes. https