America’s First People Migrated East From Island to Island
For as long as science has existed researchers have debated, and often argued, as to when, where, and how America’s first people arrived on the continent and moved south from there to South America .
The most conventional theory was that the first migrants who populated the North American continent arrived across an ancient land bridge from Asia after the enormous Cordilleran and Laurentide ice sheets receded. This event created a navigable corridor nearly 1,000 miles (1,600 km) long that emerged east of the Rocky Mountains in present-day Canada.
Since the early 1930s, the Clovis-first theory has maintained the first Asians came into the Americas via an ice-free corridor about 13,000 BC. However, over the last 20 years several major archaeological sites have been dated to thousands of years before the Clovis people arrived in North America.