In the election of 1860, Abraham Lincoln was the only presidential candidtate to take the stand against slavery. His debate with Stephen Douglas won him fame as an opponent of slavery. The southern states threatened that they would secede from the Union if Abraham Lincoln was elected president because he spoke out against slavery. After becoming president, Lincoln passed the Emancipation Proclamation of 1863 to make slavery illegal in the Confederate states. The document said, “slaves of any state…in rebellion… shall be then, thenceforward, and forever free.” Abraham Lincoln was assassinated in 1865.