The document discusses the Spanish-American War and the emergence of American imperialism in the late 19th century. Growing American desire for new markets abroad and the belief that the U.S. should spread Christianity and democracy led to increased overseas expansion. The sinking of the USS Maine in Havana harbor in 1898, which Americans wrongly blamed on Spain, helped propel the U.S. into war with Spain over Cuba. The U.S. victory enabled it to gain colonies like Puerto Rico, Guam and the Philippines, marking its emergence as a world power pursuing imperial ambitions.