The Three-Fifths Compromise was a pact between Southern and Northern states of the United States signed during the Philadelphia Convention of 1787 according to which the number of slaves, reduced to three fifths, would be added to the each state to determine the tax breakdown and the number of deputies of each state in the United States House of Representatives. It was proposed by delegates James Wilson and Roger Sherman.
In primaries, party members vote in a state election for the candidate they want to represent them in the general election. After the primaries and caucuses, each major party, Democrat and Republican, holds a national convention to select a Presidential nominee