Who counted as three fifths of a person?

Answer 1

Slaves were counted as three-fifths of a person in population numbers determining how many people would be sent to the House of Representatives. Which is sort of ironic actually, because no one in that body was actually representing the slaves--only their owners.

The Three-Fifths Compromise was a compromise reached during the 1787 United States Constitutional Convention. The effect was to give the southern states a third more seats in Congress and a third more electoral votes than if slaves had been ignored (but fewer than if counts of slaves and free persons had been lumped together), allowing the slaveholder interests to largely dominate the government of the United States until 1865 (Wikipedia).