USA HISTORY

Detailed explanation-1: -The U.S. government officially recognizes 574 Indian tribes in the contiguous 48 states and Alaska. These federally recognized tribes are eligible for funding and services from the Bureau of Indian Affairs, either directly or through contracts, grants, or compacts.

Detailed explanation-2: -In 1492 the native population of North America north of the Rio Grande was seven million to ten million. These people grouped themselves into approximately six hundred tribes and spoke diverse dialects. European colonists initially encountered Native Americans in three distinct regions.

Detailed explanation-3: -In 1775, when the Revolutionary War began, more than 250, 000 Native Americans lived east of the Mississippi River. They formed more than 80 nations and spoke dozens of languages and dialects. As fighting between British and Revolutionary forces increased in 1776, both sides called on American Indians for support.

Detailed explanation-4: -In doing so, authors calculated that about 60.5 million people lived in the Americas prior to European contact. Once Koch and his colleagues collated the before-and-after numbers, the conclusion was stark. Between 1492 and 1600, 90% of the indigenous populations in the Americas had died.