Final answer:
During the American Civil War, two regiments of black men were created in Mississippi: the 54th and 55th Massachusetts. The 54th Massachusetts Regiment became well-known for their contributions to the war effort.
Step-by-step explanation:
During the American Civil War, two regiments of black men were created in Mississippi. These regiments were the 54th and the 55th Massachusetts, which were created by Governor John Andrew of Massachusetts. The 54th Massachusetts Regiment became well-known for their contributions to the war effort. In total, it is estimated that thousands of black men served in the Union Army during the Civil War.