At the constitution convention, delegates from northern and southern states disagreed about?

Disagreements between Southern & Northern states at the Convention were counting slaves as population and slave trade regulations.

"The matter of counting slaves in the population for figuring representation was settled by a compromise agreement that established that three fifths of the slaves should be counted in apportioning representation; slaves were to be treated as property in assessing taxes. Controversy over abolishing the importation of slaves ended with agreement that the importation should not be forbidden before 1808. There were, naturally, many other points of argument, and some of the delegates were so disgusted that they went home and later led the fight in their states against the ratification of the Constitution."

Whether the federal Government should just have the power to regulate slavery.