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.
The leading theory about how early humans arrived on the American continents is the Bering Land Bridge theory. According to this theory, it is believed that around 20,000 to 30,000 years ago, during the last Ice Age, a land bridge called Beringia connected Asia and North America. As a result, it is thought that early humans migrated from Siberia across the Bering Land Bridge, following herds of animals into what is now Alaska, and gradually spread throughout the Americas over time. This theory is supported by archaeological evidence, such as the discovery of stone tools and remnants of early human settlements in areas that are now submerged under water. Additionally, genetic studies have found links between Native American populations and modern-day Siberians, lending further support to the Bering Land Bridge theory. However, it's important to note that ongoing research and discoveries may refine or expand our understanding of how early humans arrived in the Americas.
