Final answer:
The Rough Riders and the Buffalo Soldiers fought alongside each other as allies against Spain in the Spanish-American War.
Step-by-step explanation:
During the Spanish-American War, the Rough Riders and the Buffalo Soldiers fought together as allies against Spain. Although Theodore Roosevelt and his Rough Riders are often more well-known, the African American Buffalo Soldiers played a crucial role in the U.S. victory in Cuba. These experienced Black veterans fought alongside the Rough Riders in several battles and were instrumental in their success.