US CITIZENSHIP TEST PREPARATION

Detailed explanation-1: -Scientists think that these people came to North America around 13, 000 years ago by crossing the Bering Land Bridge from northeastern Asia. From there, they are thought to have spread across the northern and southern American continents.

Detailed explanation-2: -In the 1970s, college students in archaeology such as myself learned that the first human beings to arrive in North America had come over a land bridge from Asia and Siberia approximately 13, 000 to 13, 500 years ago. These people, the first North Americans, were known collectively as Clovis people.

Detailed explanation-3: -Earlier studies had indicated that people moved into the Americas at the end of the last ice age, traveling from Siberia to Alaska across a land bridge now under the Bering Sea. They spread southward, eventually reaching the tip of South America.

Detailed explanation-4: -The settlement of the Americas began when Paleolithic hunter-gatherers entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the Last Glacial Maximum (26, 000 to 19, 000 years ago).

Detailed explanation-5: -Drought, flood, and temperature changes could certainly push people to move on. Climate change also affects the food supply, and anthropologists have assumed that people came to the Americas because they were following food on the hoof.