Answer :
According to historical records, the United States' westward expansion led to conflict between numerous nations and cultural groupings.
Conflict arose between numerous nations and cultural groups as a result of United States expansion into the West.
For instance, the US Army's "Buffalo Soldiers" were Black Americans who fought against Native Americans to further the causes of settlers and the US government.
The African American soldiers of the all-Black 9th and 10th Cavalry Regiments were given the nickname "Buffalo Soldiers" in 1866, which is evidence of this.
The Buffalo Soldiers were tasked with guarding the construction of the Pacific Railroad during this time.
They also engaged in combat with several Native Americans, including Kiowas, Comanches, Cheyenne, and Arapahoe.
Hence, in this instance, "Black American" and "Native Americans" are the appropriate answers to the text.
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