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The relatively bloodless conflict between the United States and the Soviet Union was called the Cold War. It lasted from the 1950s to about 1991.
Great Britain, in the bloodless Aroostook War, 1839.
Because the people solved their objective before they had a chance to fight or in other words it was a bloodless revolution. :)
That it was not going to be a short, bloodless war.
Short and bloodlessShort and bloodless