The term "Buffalo Soldiers" refers to African American soldiers who served in the United States Army after the Civil War, primarily from 1866 to 1917. They were established by the U.S. Congress to help maintain order in the western territories and protect settlers. The nickname "Buffalo Soldiers" is believed to have originated from Native American tribes, who likened their hair to that of buffalo. Buffalo Soldiers played a crucial role in various military campaigns, including the Indian Wars and the Spanish-American War. They were instrumental in building infrastructure, such as roads and telegraph lines, and contributed to the expansion of the United States into the western frontier.