[["The Imperial Japanese Navy Air Service bombed the naval base at Pearl Harbor in Honolulu, Hawaii on Sunday morning, December 7, 1941. ", 718.0], ["Sunday morning, December 7, 1941. The attack led to the United States' formal entry into World War II the next day.", 369.0], ["The\u00a0attack on Pearl Harbor\u00a0was a surprise\u00a0preemptive\u00a0military strike by the\u00a0Imperial Japanese Navy Air Service\u00a0upon the\u00a0United States against the\u00a0naval base\u00a0Pearl Harbor in Honolulu, Hawaii, on Sunday morning, December 7, 1941, resulting in United States' formal entry into World War II\u00a0the next day.", 299.0], ["December 7, 1941", 180.0], ["December 7, 1941", 18.0], ["December 7, 1941", 2.0]]
what year did the japanese bomb pearl harbor
history