Although the Three-Fifths Compromise helped Northern and Southern states reach an agreement that allowed for ratification of the Constitution, in the long run it had a negative effect on he nation because

It helped increase the number of slaves traded. It gave the south the power to outvote the north It limited the number of states that allowed slavery

Explanation:

so they can defeat there oppenent

sitting in that one chair where he could get shot at was his worst decision.