The thirteenth amendment was adopted on December 6, 1865 and became the first amendment of the Reconstruction. This amendment abolished all slavery and involuntary servitude except for punishment for a crime. The importance of this amendment is that it was passed shortly after the Emancipation of Proclamation to show that the proclamation was not just a temporary war measure for the Civil War. President Lincoln wanted to guarantee the slaves their freedom.
In addition, it is also important to know that it took many years for this Amendment to pass. The amendment was rejected the first time by the House of Representative. It was President Lincoln whom worked closely with the House that got the amendment passed the second time around.