What is the second largest river in North America?

The Northeast American Indian cultures are also know as ______.

The Plains American Indian culture lived in_________ when following herd of buffalo

Which civilization developed the science of astronomy, a number system, and a calendar

Which civilization developed in South America?

Which civilization lived in Central Mexico and held ceremonies that included human sacrifice?

Which civilization mummified their dead?

The class structure of the Aztecs included_______.