In 1866, Congress passed legislation establishing two cavalry and infantry regiments whose composition was made up of African-American. The mounted
9th and 10th Regiments were nicknamed "Buffalo Soldiers" by the Cheyanne and Comanche.
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Whatever the reason, the name stuck, and African American regiments formed in 1866, including the 24th and 25th Infantry (which were consolidated from four regiments) became known as buffalo soldiers.