Step-by-step explanation:
Prior to the compromise, slaves were not counted when totalling the number of people in each state. The House of Representatives (part of Congress) gives each state a certain amount of representatives based on the state's population. If a state has more people, they receive more representatives. By adding in the slaves to the count of the population, the distribution for representatives in the House shifted. Southern states received more representation than before. With more representation comes more power for individual states. As a result, the Three-Fifths Compromise impacted a state's representation in Congress drastically.