In debates leading up to the three-fifths compromise, northen states argued that

Slaves should not be included when counting a state's population to determine representation in congress.

Explanation:

The three-fifths compromise was a big component of the Connecticut Compromise. Since the compromise said that representation in the House of Representatives was to be based on population, the “value” of a slave had to be defined. In particular, smaller states did not think larger states with more slaves should be allowed to consider slaves as part of their population. A compromise was reached: a slave would count as three-fifths of a person when counting population for representation.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

hope this

deadpool

explanation: