Which of these early american civilizations was largely nomadic?

I couldn't find any options, but pehaps Chichimeca is the one you need; (Chichimeca is a description of the Nahuas to many nomadc groups, not an actual name), Toltec were also largely nomadic. In the Amazon the Cambeba people among others was nomadic too.

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.