Section 1. Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.
Section 2.Congress shall have power to enforce this article by appropriate legislation.[2]
In 1863, Lincoln issued the Emancipation Proclamation, which freed slaves only in certain parts of the United States, and did not actually make slavery illegal.
Near the end of the Civil War, Republicans, who controlled Congress, introduced an amendment to make slavery illegal (against the law) in every part of the United States. (In order for an amendment to happen, it first must be passed by both the United States Senate and the United States House of Representatives, and then passed by three-quarters of the states' legislatures.) The amendment was passed by three-quarters of the states, and became law in late 1865.
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Map showing slave-holding states in black, with slavery spreading westward (1847)