Final answer:
The Buffalo Soldiers were African American soldiers who served in the United States army after the Civil War. They contributed to the war by providing protection on the frontier, building infrastructure, and engaging in combat.
Step-by-step explanation:
The Buffalo Soldiers were African American soldiers who served in the United States army after the Civil War. They were assigned to various units in the western frontier, including the 9th and 10th Cavalry Regiments. The Buffalo Soldiers played a significant role in the war by providing protection for settlers and workers on the frontier, building roads and telegraph lines, and engaging in combat against Native American tribes.
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