Pearl Harbor
Overview
On Dec. 7, 1941, Japan launched a surprise attack on the American naval base at Pearl Harbor, Hawaii. The strike marked the culmination of a decade of rising tensions as Japan expanded its empire across East Asia and the Pacific. With its industrial capacity unable to match the United States in a long-term war, Japanese leaders opted for a preemptive blow designed to cripple American naval power and delay any effective American response.
The attack—which permanently sank three American ships, damaged 15 more, and killed 2,403 Americans—was a tactical success but a strategic failure. Japanese forces did not hit the base’s oil reserves, submarine facilities, or repair yards, all of which proved crucial in the months that followed. The US Navy ultimately refloated all but three damaged ships, returning many to combat. Crucially, the fleet's three aircraft carriers were not docked at the time.
Pearl Harbor was the deadliest attack on US soil at the time, jolting the public and neutralizing what remained of isolationist or anti-war sentiment. The next day, President Franklin D. Roosevelt addressed Congress, calling Dec. 7 “a date, which will live in infamy” as he requested—and received—a declaration of war against Japan. Four days later, Adolf Hitler declared war on the US, pulling America fully into both theaters of World War II.
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