describe the geological and geographical conditions that set the stage for North American history

225 million years ago Pangea started to break apart and 2 million years ago the "Great Ice Age" happened. The oceans became glaciers and sea levels dropped. The decrease in sea level exposed an Isthmus that connected Asia and North America. This isthmus, known as the Bering Isthmus, was used by Asian colonists to get across from Asia. These Asians developed into Native tribes that made the America's their home. The Bering Isthmus was covered when Ice began to melt and sea levels rose.

describe the origin and development of the major Indian cultures in Americas.

The first Indians in the America's were Asian. They migrated across a land bridge known as the Bering Isthmus. They spread across America, where they developed into tribes such as the Incas, Mayans, and Aztecs. They were hunter-gatherers, eventhough at one point they were hunters. They respected the land and used all the resources. They didn't carelessly destroy it.