Mass human migrations into the Americas occurred around 13,400 years ago, roughly 1,000 years before the onset of the Younger Dryas.
Sources
- Mammoth-Belch Deficit Caused Prehistoric Cooling? (nationalgeographic.com)
- https://www.nature.com/articles/ngeo877 (nature.com)
- https://news.unm.edu/news/390 (news.unm.edu)
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