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Casus belli
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Law of war
international relations
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Pearl Harbor attack
Pearl Harbor attack U.S. battleship sinking during the Japanese attack of Pearl Harbor, Hawaii, December 7, 1941.

Casus belli

international relations
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Casus belli, a Latin term describing a situation said to justify a state in initiating war. The United Nations charter provides that warlike measures are permissible only if authorized by the Security Council or the general assembly or if necessary for "individual or collective self-defense" against "armed attack."

This article was most recently revised and updated by Michael Ray.