When Was the U.S. Constitution Ratified?


Quick Answer

The U.S. Constitution was finally ratified, or approved, by all states on May 29, 1790. Although the last of the original 13 states did not ratify the Constitution until 1790, the Constitution had already taken effect in March 1789, when the ninth state, New Hampshire, ratified the Constitution.

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Full Answer

The Constitution was first ratified by Delaware on Dec. 7, 1787. Intense debates in Massachusetts, Virginia and New York delayed ratification. Some states, such as North Carolina, did not ratify the Constitution until a bill of rights was added. The Bill of Rights consists of 10 amendments to the Constitution that guaranteed fundamental human rights and liberties. Almost three years passed before all states ratified the U.S. Constitution. Rhode Island, which initially refused to even sign the Constitution, finally narrowly voted to ratify it following a convention.

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