How many states had to vote for the constitution to approve it? a. two-thirds b. three-fourths c. nine of thirteen d. all thirteen

The answer is C, nine of thirteen states. It took 10 months for the initial nine states to affirm the Constitution. The primary state to confirm was Delaware, on December 7, 1787, by a consistent vote, 30 - 0. The highlighted report is a supported approval of the government Constitution by the Delaware tradition.

The US constitution was written in 1787 in Philadelphia, by delegates from 12 states. In September of 1787 it was sent to those states to be ratified. At that time there were 13 states and it was stated that for constitution to become effective 9 states from 13 would have to ratify it. so the answer to your question is C.