Westward expansion from 1865 to 1914 led to significant changes across the United States. The discovery of gold in California in 1849 sparked the Gold Rush, drawing thousands of prospectors West in search of wealth. This period also saw the expansion of the cattle industry, growth of the railroad system, and an influx of homesteaders and immigrants seeking land and opportunity. However, westward settlement increasingly came into conflict with Native American tribes, leading to broken treaties, warfare, and the eventual confinement of most tribes to reservations by the late 19th century.