United States Intro American history is but one branch of human history. To understand that branch, one must look at the trunk of human history and its prehistoric roots. Many people nowadays, including notable scientists and religious leaders, believe that the first humans appeared several million years ago. From their place of origin, probably Africa, early humans migrated into Europe, Asia, and then into the Americas. As clans of these prehistoric people migrated into different geographical regions, they adapted their lifestyles in order to survive. To increase their chances of survival, families grouped together in clans and tribes. Most primitive peoples developed economies based on hunting and gathering. In an effort to understand the mysterious forces of nature, they created myths or superstitions which explained the natural phenomena of their environment. As different groups adapted to their environments, different cultures evolved. Between 8000 and 5000 B.C. some prehistoric peoples learned how to grow crops. This discovery of agriculture brought great changes to the life-styles of these peoples. Those who learned to farm were freed from the nomadic life of hunting and gathering. They were able to settle down in one area and make permanent homes. They built cities and established political systems for controlling many people. Agriculture also led to the development of civilizations such as those in Egypt, in the Fertile Crescent, and in China. Soon civilization spread to Europe. The ancient Greek civilization fostered the idea of democratic government and intellectual inquiry. Greek ideas were copied and expanded upon by another great ancient civilization, the Roman Empire. In A.D. 476, the Roman Empire was conquered by invading barbarians from northern Europe. Without the civilizing influence of the Romans, much of Europe fell into a time of slow cultural development called the Dark Ages. But despite Europe's cultural backwardness, some important progress was made. Roman Catholic missionaries converted the pagan barbarians making Europe predominantly Christian. Another important development took place in England in 1215 when noblemen forced King John to sign the Magna Carta. This document was a major step toward the development of democratic government. It limited the power of the king and laid the foundation for the right of trial by jury and representative government in England. Meanwhile stories of Eastern lands told by Crusaders and men like Marco Polo opened the eyes of Europeans. They learned that the world was far larger and richer than they had ever dreamed. Soon the Dark Age of European backwardness gave way to an exciting time of trade and cultural exchange between West and East. European desire to trade with the East encouraged commercial growth and technological innovation. This trade also prompted the search for faster, more prosperous trade routes. Such a search by Christopher Columbus led to the discovery of the New World and its people -- the Native Americans.