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This theory suggests that the first humans to inhabit the Americas migrated from Siberia to North America via a land bridge, an area called Beringia. During the last glacial period (about 30,000 to 10,000 years ago). It connected present-day Russia and Alaska. Sea levels were much lower, due to large amounts of water being trapped in glaciers.

It includes the Chukchi Sea, the Bering Sea, the Bering Strait; the Chukchi and Kamchatka Peninsulas in Russia; as well as Alaska in the United States; and, the Yukon in Canada
Many islands too, though now some are underwater.

At its greatest extent, it was 1,000 km (620 mi) wide
Covering 1.6 million square kilometers. An area as large and Alberta, and British Columbia. (2)

The bridge existed before ocean levels rose and covered the land with water 11,000 years ago (3)(1)

Early hunter-gatherers from Siberia crossed it. Probably following large game like mammoths and bison; and, looking for resources, and better weather. Around 16,000 years ago (4)
Once in North America, they may have moved south through an ice-free corridor, where the Laurentide or Cordilleran ice sheets split, or following the Pacific coastline.

Archaeological finds, genetic studies, and linguistic research support the theory
Discoveries include ancient tools and bones. In Siberia, Alaska, Yukon, BC and Alberta.

Fossil evidence from many continents points to the extinction of very large animals, termed Pleistocene megafauna, near the end of the last glaciation (5)

It has been determined native Americans and Siberian populations have similar DNA, and their may have been linguistic connections too

While this has been the dominant theory, recent discoveries suggest that humans may have also arrived by other routes, and, earlier migrations
Such as crossing the Atlantic, or Pacific oceans; or on glaciers, and land like the Solutrean hypothesis.

Check it out with some more neolithic architecture today!

Cite:
1) Jakobsson, Martin; Pearce, Christof; Cronin, Thomas M.; Backman, Jan; Anderson, Leif G.;
Barrientos, Natalia; Björk, Göran; Coxall, Helen; De Boer, Agatha; Mayer, Larry A.; Mörth, Carl-
Magnus; Nilsson, Johan; Rattray, Jayne E.; Stranne, Christian; Semilietov, Igor; O’Regan, Matt
(2017). “Post-glacial flooding of the Beringia Land Bridge dated to 11,000 cal yrs YBP based on
new geophysical and sediment records” (https://doi.org/10.5194%2Fcp-2017-11). Climate of
the Past Discussions: 1–22. doi:10.5194/cp-2017-11 (https://doi.org/10.5194%2Fcp-2017-11)

2) Dr Barbara Winter (2005). “A Journey to a New Land” (https://web.archive.org/web/201504282
31158/http://www.sfu.museum/journey/an-en/postsecondaire-postsecondary/pont_beringie-beri
ngia_bridge). sfu.museum. virtualmuseum.ca. Archived from the original (https://sfu.museum/jo
urney/an-en/postsecondaire-postsecondary/pont_beringie-beringia_bridge) on 28 April 2015

3) Elias, Scott A.; Short, Susan K.; Nelson, C. Hans; Birks, Hilary H. (1996). “Life and times of the
Bering land bridge”. Nature. 382 (6586): 60. Bibcode:1996Natur.382…60E (https://ui.adsabs.harvard.edu/abs/1996Natur.382…60E). doi:10.1038/382060a0 (https://doi.org/10.1038%2F382060a0). S2CID 4347413 (https://api.semanticscholar.org/CorpusID:4347413)

4) “Home” (https://bbcearth.com). bbcearth.com. BBC Earth.

5) Elias, S.A.; Schreve, D. (2016) [2013]. “Late Pleistocene Megafaunal Extinctions” (https://web.
archive.org/web/20161220173549/https://pure.royalholloway.ac.uk/portal/files/1398773/Article_
318_Late_Pleistocene_megafaunal_extinctions.pdf) (PDF). Encyclopedia of Quaternary
Science (in Reference Module in Earth Systems and Environmental Sciences, pp. 3202–17).
pp. 700–712. doi:10.1016/B978-0-12-409548-9.10283-0 (https://doi.org/10.1016%2FB978-0-12
-409548-9.10283-0). ISBN 978-0-12-409548-9. S2CID 130031864 (https://api.semanticscholar.
org/CorpusID:130031864). Archived from the original (https://pure.royalholloway.ac.uk/portal/fil
es/1398773 Article_318_Late_Pleistocene_megafaunal_extinctions.pdf) (PDF)

Bibliography:
Armstrong, Edward; Hopcroft, Peter O.; Valdes, Paul J. (7 November 2019). “A simulated Northern Hemisphere terrestrial climate dataset for the past 60,000 years”. Scientific Data. 6 (1): 265. Bibcode:2019NatSD…6..265A. doi:10.1038/s41597-019-0277-1. PMC 6838074. PMID 31700065.

Mithen, Steven (2004). After the Ice: a global human history, 20.000–5.000 BC. Cambridge MA: Harvard University Press. p. 3. ISBN 978-0-674-01570-8

National Park Service. (2010, February 1). Bering Land Bridge National Preserve (U.S. National Park Service. Retrieved from: https://www.nps.gov/bela/index.htm

Briney, A. (2019, February 15). A geographic overview of the Bering Strait. ThoughtCo. https://www.thoughtco.com/geographic-overview-bering-land-bridge1435184#:~:text=The%20Bering%20Land%20Bridge%2C%20also,during%20Earth’s%20historic%20ice%20ages

Guthrie RD. 2001 Origin and causes of the mammoth steppe: a story of cloud cover, woolly mammal tooth pits, buckles, and inside-out Beringia. Q. Sci. Rev. 20, 549–74

Waters, M. R. (2019). Late Pleistocene exploration and settlement of the Americas by modern humans. Science, 365(6449). https://doi.org/10.1126/science.aat5447