The American spelling of demilitarisation; the removal of military forces and weapons from a region.
From de- (remove) and militarization. Standard in American English treaties and international documents since the 20th century.
Japan's demilitarization after World War II in 1945 was so successful that today Japan has a Self-Defense Force instead of a military, and they still can't officially wage war—written into their constitution by the Americans!
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