<P> The Three - Fifths Compromise gave a disproportionate representation of slave states in the House of Representatives relative to the voters in free states until the American Civil War . In 1793, for example, Southern slave states had 47 of the 105 members but would have had 33, had seats been assigned based on free populations . In 1812, slave states had 76 out of 143 instead of the 59 they would have had; in 1833, 98 out of 240 instead of 73 . As a result, Southern states had disproportionate influence on the presidency, the speakership of the House, and the Supreme Court in the period prior to the Civil War . Along with this must be considered the number of slave and free states, which remained mostly equal until 1850, safeguarding the Southern bloc in the Senate as well as Electoral College votes . </P> <P> Historian Garry Wills has postulated that without the additional slave state votes, Jefferson would have lost the presidential election of 1800 . Also, "slavery would have been excluded from Missouri...Jackson's Indian removal policy would have failed...the Wilmot Proviso would have banned slavery in territories won from Mexico...the Kansas - Nebraska bill would have failed ." While the Three - Fifths Compromise could be seen to favor Southern states because of their large slave populations, for example, the Connecticut Compromise tended to favor the Northern states (which were generally smaller). Support for the new Constitution rested on the balance of these sectional interests . </P> <P> Section 2 of the Fourteenth Amendment (1868) later superseded Article 1, Section 2, Clause 3 and explicitly repealed the compromise . It provides that "representatives shall be apportioned...counting the whole number of persons in each State, excluding Indians not taxed ." A later provision of the same clause reduced the Congressional representation of states who denied the right to vote to adult male citizens, but this provision was never effectively enforced . (The Thirteenth Amendment, passed in 1865, had already eliminated almost all persons from the original clause's jurisdiction by banning slavery; the only remaining persons subject to it were those sentenced for a crime to penal servitude, which the amendment excluded from the ban .) </P> <P> After the Reconstruction Era came to an end in 1877, however, the former slave states subverted the objective of these changes by using various strategies to disenfranchise their black citizens, while obtaining the benefit of apportionment of representatives on the basis of the total populations . These measures effectively gave white Southerners even greater voting power than they had in the antebellum era, inflating the number of Southern Democrats in the House of Representatives as well as the number of votes they could exercise in the Electoral College in the election of the president . </P>

What nullified the 3/5 compromise in the us constitution