Which action abolished slavery in the US?

The abolition of slavery in the United States was primarily achieved through the Thirteenth Amendment to the Constitution, which was ratified on December 6, 1865. This amendment formally abolished slavery and involuntary servitude, except as punishment for a crime. The Emancipation Proclamation, issued by President Abraham Lincoln in 1863, also played a crucial role by declaring the freedom of enslaved people in Confederate states, paving the way for the eventual constitutional change.