The 13th Amendment to the United States Constitution, ratified in 1865, abolished slavery and involuntary servitude, except as punishment for a crime. This amendment marked a pivotal moment in American history by ensuring that no person could be legally held as a slave, laying the foundation for future civil rights advancements. Its passage was a direct response to the social and political upheaval following the Civil War and was instrumental in redefining individual liberties in the United States.