President Abraham Lincoln signs the Territorial Slavery Act of 1862, which prohibits slavery in all current and future United States territories.

Abraham Lincoln was the 16th president of the United States, serving from 1861 until his assassination in 1865. He led the United States through the American Civil War, defeating the Confederate States of America and playing a major role in the abolition of slavery.

An Act to secure Freedom to all Persons within the Territories of the United States, 12 Stat. 432, ch. 111, §1, colloquially known as the Territorial Slavery Act of 1862, is a federal law passed by the United States Congress prohibiting slavery in all current and future territories of the United States. Congress passed the legislation on June 9, 1862, and President Abraham Lincoln signed it into law on June 19, 1862.

June 19 is the 170th day of the year in the Gregorian calendar; 195 days remain until the end of the year.