The first people who crossed the Bering land bridge to migrate to North America were known as "Clovis People", which were the name archaeologists given to the earliest human culture in the North American continent. Scientists have found new evidence of stone tools dated from 1,000 year before Clovis, there still lack of enough evidence to disproved Bering Bridge theory. In the other hand, there is enough genetic and archaeological evidence to support the first inhabitants of North America came from Africa after evolution and climate changes, arrived in Siberia lived there thousands of years, crossed the Bering land bridge passed through the ice-free corridor in Alaska and settled in North America.
Thousands of years ago there was a dramatic climate change in Africa continent. Once a humid forest became a dry land, which contributed tremendously to the human evolution. The Apes once before able to get fruits and seeds from three to three now had to travel long distance to find food and the great human evolution is illustrated in table 1, each species with own characteristics and the approximated time that took place. Once it evolved into Homo erectus they started moving out of Africa looking for better places for food, shelter and climate conditions. This Hominid that left Africa continue to evolve into Homo sapiens as they did simultaneously at different areas of the world. The first human migrations originated in Africa more than 70,000 years ago and eventually came to populate the entire world. Scientists believe that a small group of people left Africa and took few generations to migrate all the way from Africa to populate North America. Scientists found the most variation in DNA evidence is from humans who originated in Africa, which showed that people have been evolved for a long period of time. In other words, scientists believed that all humans are children of Africa because they could track DNA from today people back from DNA of human remains found in people from Africa.
