The Spanish-American War, fought in 1898, significantly influenced U.S. foreign policy by marking the country's emergence as a global power. The war primarily stemmed from American intervention in Cuba's struggle for independence from Spain, with motivations including economic interests and humanitarian concerns. The conflict resulted in a swift victory for the U.S., leading to the Treaty of Paris, in which Spain relinquished control of Cuba and ceded Guam, Puerto Rico, and the Philippines to the United States. This expansion of territory marked a shift in American imperial ambitions, establishing the U.S. as an influential player in international affairs and colonial governance.