The African American regiment was the Buffalo Soldiers, who served in the United States Army from 1866 to 1948. The regiment was originally formed as the 10th Cavalry Regiment, and was later joined by the 24th and 25th Infantry Regiments. The Buffalo Soldiers fought in numerous conflicts, including the Indian Wars, the Spanish-American War, and World War I. The regiment was also instrumental in the development of the American West, playing a key role in the construction of roads, bridges, and other infrastructure. The Buffalo Soldiers were known for their courage and bravery, and their legacy of service continues to be celebrated today.