Final answer:
The North opposed the 3/5s Compromise because it gave the South unfair representation in the House of Representatives.
Step-by-step explanation:
The North hated the 3/5s Compromise because it gave the South undue representation in the House. The 3/5s Compromise was an agreement reached during the Constitutional Convention of 1787 that stated that enslaved individuals would be counted as three-fifths of a person when determining a state's population for representation in the House of Representatives. This compromise heavily favored the South, as it had a larger enslaved population, giving them more seats in the House and therefore more political power.
Learn more about The North's opposition to the 3/5s Compromise