Abraham Lincoln issued the emancipation proclamation which led to abolishing slavery in the US

On January 1, 1863, Abraham Lincoln issued the Emancipation Proclamation, which began the process of emancipating America's slaves. During the American Civil War, the proclamation permitted black soldiers to fight for the Union against the Confederacy. It also paved the way for the Thirteenth Amendment, which outlawed slavery and indentured servitude in the United States. Because he was assassinated in April, Lincoln was unable to witness the ratification of the Amendment in December 1865. In 1862, President Abraham Lincoln issued the Emancipation Proclamation, which freed more than three million Confederate slaves.

The slaves in the Border States, however, were unaffected by the Proclamation. In addition, the proclamation called for black military units to fight alongside Union forces, which resulted in more than 100.000 African Americans fighting in the Civil War. However, the Emancipation Proclamation wasn’t a law passed by Congress, so Lincoln insisted on an antislavery amendment to the U.S. Constitution, which will make his proclamation come true. Unfortunately, even though Congress passed it in 1865, slaves in the States stayed in a bad position for many years after that.