Arrival of the first Americans and Plains Indians

1. Explain the four theories on how the Americas became inhabited

Well the first theory was the Ice/Land Bridge theory. It said that Russia was touching Alaska by either the ice or by land.
The second theory was the Native Americans had always lived in the Americas.
The third Theory was that some of the ten tribes of Israel got scattered to the Americas.
The fourth Theory is the most unlikely. It is that the sailors got lost and ended up in the Americas. But you need men and women to start life so unless there were woman on board this doesn't work.

2. Explain how and why people spread out once they were in the Americas.

 Well the hunters and gatherers had to roam for their food because they didn't grow it they had to find animals and fruit to eat. So they kept on spreading. They also wanted land for themselves

3. Explain how the Plains Indians adjusted to the environment they lived in.

Well they killed a lot of buffalo to eat but when the United states killed almost all of the buffalo they didn't have much to eat. Then the Americans taught them how to grow food. Then they got horses so they could hunt even better.