Sep 17, 1787:
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The Constitutional Convention adopted the Constitution in May 1787. The Constitution was adopted on September 17, 1787.
The resolution to become independent was officially adopted on July 2, 1776. It was on July 4th that congress adopted the actual Declaration of Independence.
July 2, 1776
The Indian constitution was adopted in the year 1949.
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.