[tacticalogic]

One could say that it was the South which benefited from apportionment since 60% of their slave population, which had no need for representation in Washington since they were property and not citizens, was counted when deciding congressional representation.

One could say that. If one does, one should be prepared to explain what benefit they got from having fewer Representatives in Congress. While not considered "property", the Northern states had substantial numbers of un-naturalized immigrants that were not citizens, but still counted fully as residents in the census.

[DoodleDawg]

While not considered "property", the Northern states had substantial numbers of un-naturalized immigrants that were not citizens, but still counted fully as residents in the census

No, they were not property. They were free people with rights and interests that needed protection. So they did gain benefit from their representatives in Congress. Slaves did not.