The significance of the Spanish-American War (1898) for U.S. foreign policy was profound, marking the transformation of the United States into an imperial power. The war resulted from tensions over Spain’s military actions in Cuba and American interests in the region. Following a swift victory, the Treaty of Paris granted the U.S. control over Puerto Rico, Guam, and the Philippines, showcasing American military strength. This expansion significantly altered U.S. foreign relations and perceptions, as the nation sought to exert its influence in the Caribbean and Pacific. It also prompted debates over imperialism, leading to a more assertive American presence on the global stage.