Are leftists incapable of understanding the 3/5 Compromise, or do you really think you can capitalize by lying about it? The south wanted to count every single slave as a whole person for the purposes of congressional apportionment. The north argued that they shouldn't be counted at all. In order to placate the south, the 3/5 compromise was offered.
It's kind of like how the south wanted only proportional representation, but the north wanted equal representation, so the Connecticut delegation offered the compromise to have both. Anyway, true to form, you lying leftists have been claiming that the Senate was set-up to benefit slave states.