Answer:
The statement that best describes the Rough Riders' contribution to the Spanish-American War is that they won the war's bloodiest battle at San Juan Hill.
The Rough Riders were a volunteer cavalry unit organized by Theodore Roosevelt, who later became President of the United States. The Rough Riders played a crucial role in the Battle of San Juan Hill, which was a significant battle during the war. The battle took place on July 1, 1898, and was a joint operation between American forces and Cuban rebels. The Rough Riders and other American troops played a crucial role in the battle, which resulted in the Spanish forces retreating from the area. The victory at San Juan Hill helped to secure the American victory in the Spanish-American War.
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