[["The attack on pearl harbor was carried out by the Imperial Japanese Navy Air Service on December 7th, 1941.", 130.0], ["The military forces of the empire of Japan attacked Pearl Harbor, Hawaii on December 7th, 1941.", 108.0], ["Japanese forces attacked the U.S. naval base, Pearl Harbor, on December 7th, 1941.", 68.0], ["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.", 18.0], ["Japan\n", 7.0]]
who attacked pearl harbor in nineteen forty one
history