What is the leading theory about how early humans arrived on the American continents?

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Answer 1

The leading theory among scientists is that early humans, known as Paleoindians, migrated to the American continents from Asia via a land bridge called Beringia. This land bridge emerged during the last ice age when sea levels dropped, connecting northeastern Asia with northwestern North America. It is believed that these early humans crossed the bridge around 15,000-20,000 years ago and gradually spread across the American continents. This theory is supported by archaeological evidence, genetic studies, and similarities between indigenous people in Asia and the Americas. However, it is important to note that this is a continually evolving field of research and new evidence may emerge that could refine or challenge this theory in the future.