The Mound Builders were American Indian groups who​

The Mound Builders were farmers who lived in settled communities the main crop they grew was corn. The Mound Builders were not a single group of people. The three main groups were the Adena, Hopewell, and Mississippians. ~ hope this helped luv :)

Explanation:

false the first governing document in the us history was the articles of federation

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers