Pearl Harbor is a U.S. naval base near Honolulu, Hawaii, that was attacked by Japanese forces on December 7, 1941. This event led directly to U.S. involvement in World War II.
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World War II: The global conflict that took place between 1939-1945 involving many of the world's nations divided into two opposing military alliances: Allies vs Axis powers.
Isolationism: A policy or doctrine advocating keeping one's country's affairs separate from those of other nations by declining to enter into alliances or international economic commitments.
Hiroshima & Nagasaki: Two Japanese cities on which the U.S dropped atomic bombs in August 1945 leading to Japan’s unconditional surrender in World War II.