Who were the 3 main groups of early Americans?

Paleo-Indians,indigenous peoples of the Americas and Lithic stage

Explanation:

Paleo-indians were the first peoples who entered, and subsequently inhabited, the Americas during the final glacial episodes of the late Pleistocene period.The indigenous peoples of the Americas are the pre-Columbian peoples of North, Central and South America and their descendants.Lithic stage was the earliest period of human occupation in the Americas, as post-glacial hunters and collectors spread through the Americas

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

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