Which amendment abolished slavery in the United States?

The Thirteenth Amendment is the correct answer because it specifically states the abolition of slavery and involuntary servitude in the United States. Ratified in 1865, this constitutional amendment marked a significant turning point in American history by formally ending the practice that had long been a source of division and conflict within the nation. The amendment's text clearly conveys its purpose by prohibiting slavery except as a punishment for a crime, which was a crucial step towards civil rights and equality.

In contrast, the First Amendment addresses rights related to free speech, religion, press, assembly, and petition, fundamentally focusing on individual liberties rather than the abolition of slavery. Meanwhile, the Nineteenth Amendment granted women the right to vote, and the Fifteenth Amendment prohibited the denial of the right to vote based on race, color, or previous condition of servitude. Although these amendments contributed to civil rights, they do not pertain to the abolition of slavery itself, which is uniquely addressed by the Thirteenth Amendment.