As the U.S. Constitution was being written, each delegate represented his state in the debates about how to set up this new national government. The Three-fifths Compromise was an agreement where each slave was counted as three-fifths of a person to determine each state's population. Which region of the United States benefited the most from this compromise? A) The Northern states since they employed so many slaves in their factories. B) The New England states since they employed so many slaves in their mining and logging industries. C) The Mid-Western states since they employed so many slaves on their large ranches. D) The Southern states since they employed so many slaves on their plantations.

At the signing of the Constitution, most of the slaves in the U.S. were found in the South, working on plantations. The number of delegates a state gets is dependent on its population, so it is good for a state to have a large population count. The South benefitted from the 3/5 compromise because it boosted their population numbers, giving them more delegates (more delegates mean they control more of the government, which states want).