Final answer:
The actions of Roosevelt and his Rough Riders on San Juan Hill helped him become president by making him a national hero, boosting his popularity, and paving the way for his political career.
Step-by-step explanation:
The actions of Theodore Roosevelt and his Rough Riders on San Juan Hill during the Spanish-American War helped him become president in several ways:
- Roosevelt's leadership and bravery during the charge up Kettle Hill on the San Juan Heights made him a national hero and gained him widespread recognition and popularity.
- The publication of his memoir, 'The Rough Riders,' which highlighted his role in the battle, further elevated his public image.
- Roosevelt's military service and the reputation he gained as a war hero helped him secure political appointments and build a successful political career that ultimately led to his election as president.