After Christopher Columbus and other European adventurers landed in the Americas during the 15th and 16th centuries, the lands they explored were often called the "New World." However, North, South, and Central America were new only to the people of Europe. Native Americans had lived on the land for millions of years.In some cases, the natives and Europeans were able to live in peace and even learned from each other. Most of the time, however, the European invaders brought with them disease and violence, which spelled the end of the Native Americans'' way of life.