Nine of the 13 states were needed to ratify the Constitution. The first nine states were Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, and New Hampshire.
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The first states to ratify in order with the corresponding dates:
1. Delaware- December 7th 1787
2. Pennsylvania- December 11th 1787
3. New Jersey- December 18th 1787
4. Georgia- January 2nd 1788
5. Connecticut- January 9th 1788
6. Massachusetts- February 6th 1788
7. Maryland- April 26th 1788
8. South Carolina- May 23rd 1788
9. New Hampshire- June 21rst 1788
All states (13) finally ratified by May 1790.
Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, New Hampshire
9 states were needed to ratify the Constitution
9 states
Article VII of the US Constitution required 9 states to ratify the Constitution for it to be effective.
As directed by Congress, states held ratification conventions, to either ratify or reject the proposed US Constitution. It was required that 9 states ratify in order for the Constitution to become official.
At least 9 of the 13 states agreed to ratify it.