Which amendment made the three fifths compromise meaningless?

The Three-Fifths Compromise became meaningless with the ratification of the 14th Amendment in 1868. This amendment established that all persons born or naturalized in the United States are citizens and mandated equal protection under the law. It effectively disregarded the previous counting of enslaved individuals as three-fifths of a person for congressional representation, thereby affirming the principle of full citizenship for all individuals.