Final answer:
The North opposed the 3/5 Clause because it gave disproportionate political power to the Southern states.
Step-by-step explanation:
The North opposed the 3/5 Clause. The Three-Fifths Compromise, implemented through the 3/5 Clause, allowed enslaved individuals to be counted as three-fifths of a person for the purpose of determining representation in the House of Representatives and taxation. This compromise was viewed unfavorably by many in the North because it gave disproportionate political power to the Southern states, which had a large enslaved population.