What is the name of the all black regiment of the us army1866?

The all-black regiment of the U.S. Army established in 1866 is known as the United States Colored Troops (USCT). Specifically, one of the most famous regiments was the 10th Cavalry Regiment, which was one of the original four African American cavalry regiments formed during this time. These troops played a significant role in the post-Civil War era, particularly in the Indian Wars and other military campaigns. They were often referred to as "Buffalo Soldiers," a nickname that highlighted their bravery and resilience.