The historical impact of the Gold Rush in the United States during the 1840s was profound, as it accelerated westward expansion and economic growth. The discovery of gold in California in 1848 attracted hundreds of thousands of prospectors, known as "49ers," leading to a population boom and the rapid development of towns and infrastructure. This influx of people stimulated the economy but also sparked tensions over land and resources, particularly with Native American populations. The Gold Rush also played a crucial role in California's admission as a state, shaping the nation’s demographic and cultural landscape.