The late 19th century marked a significant period of American expansionism and U.s. imperialism that reshaped the nation's global influence and territorial holdings.
The Spanish-American War of 1898 proved to be a pivotal moment that demonstrated America's growing imperial ambitions. The United States emerged victorious from this brief but consequential conflict, gaining control of former Spanish colonies including Puerto Rico, Guam, and the Philippines. While this expansion enhanced American military and economic power, there were significant negative effects of the Spanish-American War, including the suppression of independence movements in acquired territories and the human cost of subsequent conflicts, particularly in the Philippines. The war helped establish the United States as a world power, but it also sparked intense domestic debate about Arguments against Imperialism.
The period also saw the strategic annexation of Hawaii in 1898, which had profound implications for American influence in the Pacific. The process leading to Hawaii's incorporation into the United States reveals complex dynamics of economic interests, military strategy, and cultural impact on native Hawaiians. This territorial expansion, along with the purchase of Alaska from Russia in 1867, significantly expanded American territory beyond the continental United States. The concept of Manifest Destiny evolved from continental expansion to overseas imperialism, driven by economic opportunities, military strategic interests, and cultural beliefs about American exceptionalism. The 3 reasons for us expansion overseas in the late 19th century primarily included the search for new markets, the desire for military bases and coaling stations, and the belief in America's civilizing mission. This period of expansion had lasting effects on international relations, domestic politics, and the peoples of acquired territories, establishing patterns of American global involvement that would continue into the 20th century and beyond.