On February 15, 1898, the armored cruiser USS Maine exploded and sank in Havana Harbor, Cuba, killing 266 crewmen. The cause remains debated (internal coal bunker fire vs. external mine), but the immediate U.S. political and media reaction—fueled by "yellow journalism" (Hearst, Pulitzer)—blamed Spain.
The Maine disaster ignited American jingoism, provided a casus belli for imperial expansion, and marked the U.S. emergence as a global power. Modern investigations (1976, 1998, 2002) lean toward spontaneous combustion in a coal bunker, but the political die was cast in 1898.