The Eighteenth Amendment to the Constitution of Pakistan, which reduced the powers of the President of Pakistan
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Homer vs. the Eighteenth Amendment, an episode of the television series The Simpsons
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The Eighteenth Amendment of the Constitution of Ireland, which permitted the state to ratify the Amsterdam Treaty
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Prohibition was declared in Canada on 23 December 1917; in April 1918, it became illegal to transport alcohol in Canada; in 1920, the Eighteenth Amendment prohibited sale of alcohol in the United States.
The nation was highly optimistic and the leading prohibitionist in the United States Congress confidently asserted that "There is as much chance of repealing the Eighteenth Amendment as there is for a hummingbird to fly to the planet Mars with the Washington Monument tied to its tail.