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The U.S. Constitution was adopted on September 17, 1787, 11 years after the United States declared it's independence from Great Britain. It was ratified by conventions in eleven states and it went into effect on March 4, 1789. The Constitution is the supreme law of the U.S. which guides American law as well as political culture.

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11y ago
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13y ago

It was written between May and September 1787.

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12y ago

June 1788 is the date when the 13th state ratified it. That's when it officially became "the law of the land"

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Q: In which year was the American Constitution adopted?
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