This program takes a look at North America's first inhabitants, Native Americans, along with the changes that took place in the various tribes after the European explorers came to America in the 15th century. See how three worlds eventually collided as Europeans brought several million Africans to the New World to serve as forced labor for the new plantation economies of the Americas. Also, discover how the Columbian Exchange set off a series of cultural, economic and biological changes that fundamentally transformed the world's population and influenced the emergence of a new American society. Teacher's guide included. DVD features: Spanish language track, chapter selection, and interactive assessment tool. .