It takes a three-fourths ratio from the states to pass an amendment. Before an amendment goes to the states, it has to pass both house of legislature.
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Three fourths.
2/3 of both houses The above is incorrect. For an amendment to become part of the Constitution it must be ratified by 3/4th's of the States. With 50 states, this means 38 states must ratify and accept the amendment--this can take years and some amendments have never been ratified. It does take 2/3rd's of both houses of Congress to pass an amendment before it goes to the states to be ratified.
If you are speaking of the 26th Amendment to the United States Constitution, it was signed into law on July 1st, 1971.42 states ratified it. These 8 still have not:FloridaKentuckyMississippiNevadaNew MexicoNorth DakotaSouth DakotaUtah
38, or 3/4 of the states must approve of the amendment before it can me added to the Constitution. This process does not have to happen simultaneously. It's typically for the process to take several months or even years. As soon as the criteria is reached, the amendment passes. Four amendments, some as far back as 1789 are still technically pending approval.
The Eighteenth Amendment (Amendment XVIII) of the United States Constitution effectively established the prohibition of alcoholic beverages in the United States by declaring the production, transport, and sale of alcohol (though not the consumption or private possession) illegal. The Amendment was the first to set a time delay before it would take effect following ratification, and the first to set a time limit for its ratification by the states. Its ratification was certified on January 16, 1919, with the amendment taking effect on January 16, 1920.The amendment was repealed in 1933 by ratification of the Twenty-first Amendment, the only instance in United States history that a constitutional amendment was repealed in its entirety.