President Abraham Lincoln issued two emancipation proclamations—one on September 22, 1862, and another one hundred days later. In the Preliminary Emancipation Proclamation, Lincoln declared that all slaves would be "forever" free on January 1, 1863, unless the Confederate states returned to the Union. Lincoln followed through with his promise, and on New Year's Day 1863 he signed the final Emancipation Proclamation.
The document in the New York State Library is Lincoln's original handwritten draft of the preliminary proclamation. It also includes penciled additions by Secretary of State William Henry Seward.
Listen to an Audio Transcription of the Emancipation Proclamation.