For thousands of years, the inhabitants who lived on the American continents lived off the land. Then, in 5000 B.C. near present day Mexico, many groups of people began to discover farming.
They realized that they could plant crops such as corn, pumpkins, potatoes and squash, and by doing so, could better provide for the needs of their people.
This new technology spread from Mexico outward to other parts of the Southwest, so that by 3000 B.C., many groups of people in the region were actively practicing farming.