Buffalo Soldier is a slur used to describe Blacks in a derogatory way. When the U.S. government was clearing the West of Native Americans, they sent many black units to hunt them down. The Indians thought they looked like buffalo.
The word Buffalo Soldier is a racial slur that has been used historically to degrade and dehumanize blacks. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to blacks. If you are unsure about whether or not it is appropriate to use the word Buffalo Soldier, it is best to err on the side of caution and avoid using it in any situation.