Which amendment to the Constitution abolished slavery in the United States?

The Fourteenth Amendment, ratified in 1868, primarily addresses citizenship rights and equal protection under the law for all persons, particularly former slaves. While it expanded civil rights, it did not specifically abolish slavery, which was already accomplished by the Thirteenth Amendment.

Ratified in 1870, the Fifteenth Amendment focuses on granting African American men the right to vote, prohibiting the federal and state governments from denying this right based on race. Although it played a significant role in civil rights, it did not pertain to the abolition of slavery.

The Sixteenth Amendment, ratified in 1913, authorizes Congress to impose an income tax without apportioning it among the states. This amendment has no connection to slavery or its abolition, as it deals strictly with taxation issues.

Ratified in 1920, the Nineteenth Amendment granted women the right to vote, marking a significant advancement for women's suffrage. However, it does not address the issue of slavery, which had already been resolved by the Thirteenth Amendment.