The American Frontier was a time in the United States when people explored and settled the West, which was a big unknown area back then. It was a time when people moved away from towns and cities and began to set up farms and ranches and explored the wilderness. People also began to hunt and fish out in the wilderness in order to get food to feed their families. The Native Americans already living in the area also helped the settlers who moved out west by teaching them how to survive in the wilderness. The American Frontier ended when settlers had explored and filled up the West.