Answer :
The Supreme Court decision that was overturned by the ratification of the Fourteenth Amendment to the U.S. Constitution was:
- Dred Scott v. Sandford
In the Dred Scott v. Sandford case, the Supreme Court ruled in 1857 that African Americans, whether enslaved or free, were not considered American citizens and therefore did not have the right to sue in federal court. This decision was a major factor leading to the Civil War and was later overturned by the Fourteenth Amendment, which granted citizenship to all persons born or naturalized in the United States, regardless of race. This amendment also ensured equal protection under the law for all citizens and prohibited states from infringing upon their rights.