18th Amendment
The Eighteenth Amendment may refer to:
Eighteenth Amendment to the United States Constitution, which established Prohibition
Eighteenth Amendment of the Constitution of India, 1966 amendment which clarified the meaning of "state"
Eighteenth Amendment of the Constitution of Ireland, which permitted the state to ratify the Amsterdam Treaty
Eighteenth Amendment to the Constitution of Pakistan, which reduced the powers of the President of Pakistan
Eighteenth Amendment of the Constitution of South Africa, which made South African Sign Language an official language
Homer vs. the Eighteenth Amendment, an episode of the television series The Simpsons
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