Theories of Human Migration to America
The first humans reached America approximately 100,000 years ago. The most accepted theory posits that a drop in sea level created ocean gateways, allowing humans to cross from Asia to America. These early humans lived in nomadic bands of no more than 40 people.
Alex Hrdlička's Bering Strait Theory
This theory, known as the Single Origin Theory or Asian Immigrationism Theory, proposes that as sea levels declined, an exposed continental shelf connected Asia and America. Early humans, following animals for food, crossed this land bridge.
Florentino Ameghino's Autochthonous Theory
This theory, known as the Autochthonous Theory or Theory of Indigenous Origin, posits that humanity originated in America, not the...