Who lived in America before the Europeans arrived?

Various indigenous peoples, collectively known as the Native Americans. These people were not a single homogeneous nation, but were divided into many tribes and people groups, such as the Iroquois, Algonquins, Apaches, and Blackfeet.

Over 500 tribes of Native Americans, whose ancestors migrated over a "land bridge" from Asia after the last Ice Age, during prehistory.
Native Americans, the majority of which died of diseases (e.g. smallpox, measles, mumps) within a few years of the arrival of the first European explorers. Thus when the colonists arrived the land was almost empty of people.
Natives or Indians