Why might have americans have known about the land west of the mississppi river

Which of the following cultures were among the earliest known inhabitants of north america? a) mayab) incac) anasazi d) olmec

As a result of the germanic tribes sacking rome

Which is a result of the free exercise clause? parents can prevent their children from being vaccinated. people with a religious objection to military service cannot be drafted. businesses that sell religious materials can be open only on sundays. amish children do not have to attend school past the eighth grade.