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Armistice Day is the end of World War I, November 11, 1918. The armistice officially took effect at eleven o'clock in the morning—the "eleventh hour of the eleventh day of the eleventh month."
This was celebrated as a national holiday each year in many of the former allied nations. After World War II, it was changed to Veteran's Day in the United States and to Remembrance Day in the British Commonwealth.