Why did it take 6 years before Florida became a state? How was the conflict solved?

Florida wanting to enter the union as a slave state caused much difficulty. congress struggled to maintain the balance of a free state and a slave state. as a result Florida had to wait 6 years for their wish.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.