Did only 2 states north Carolina and Rhode Island not be approved by the constitution until after it went into affect?

Yes, North Carolina and Rhode Island were the only two states that did not ratify the U.S. Constitution until after it went into effect in 1789. North Carolina ratified the Constitution in November 1789, while Rhode Island followed in May 1790. Their initial hesitance was due to concerns over the lack of a Bill of Rights and the potential for federal overreach.