Westward Expansion was one of the most significant periods in American history, spanning much of the 19th century as the United States grew from a small collection of eastern states into a nation stretching from coast to coast. This page brings together all of History Crunch’s Westward Expansion articles, covering the causes and background of American expansion, the displacement of Native Americans, the lives of pioneers and settlers, key figures of the era, and the lasting impacts of westward growth on the United States.