Final answer:
President Roosevelt rallied and supported the American attack on San Juan Hill during the Spanish-American War. He organized the Rough Riders and played a crucial role in the assault, boosting morale and support.
Step-by-step explanation:
During the Spanish-American War in 1898, President Roosevelt rallied and supported the American attack on San Juan Hill as the Assistant Secretary of the Navy. He saw an opportunity for the United States to gain control of Cuba and Puerto Rico, and advocated for military action. Roosevelt helped organize the Rough Riders, a volunteer cavalry unit, which played a crucial role in the assault on San Juan Hill. His leadership and determination boosted morale and support for the American attack.
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