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The Answer of my question is the 13th Amendment

The 13th Amendment was established after the Civil War in 1865.
The thirteenth amendment to the Constitution of the United States was proposed to the legislatures of the several States by the Thirty-eighth Congress, on the 31st day of January, 1865, and was declared, in a proclamation of the Secretary of State, dated the 18th of December, 1865, to have been ratified by the legislatures of twenty-seven of the thirty-six States.This amendment was rejected (and not subsequently ratified) by Mississippi, December 4, 1865.
The American Civil War (1861–1865) was a major war between the United States (the "Union") and eleven Southern states which declared that they had a right to secession and formed the Confederate States of America, led by President Jefferson Davis. The Union, led by President Abraham Lincoln and the Republican Party, rejected any right of secession and opposed the expansion of slavery into territories owned by the United States. Fighting commenced on April 12, 1861, when Confederate forces attacked a United States (federal) military installation at Fort Sumter in South Carolina, located in the Confederate States of America.
Harriet Tubman was a runaway slave from Maryland who became known as the "Moses of her people." Over the course of 10 years, and at great personal risk, she led hundreds of slaves to freedom along the Underground Railroad, a secret network of safe houses where runaway slaves could stay on their journey north to freedom. She later became a leader in the abolitionist movement, and during the Civil War she was a spy for the federal forces in South Carolina as well as a nurse. Harriet Tubman was working hard to try and set the slaves free. She believed in Freedom for the slaves and that all people would be treated equally.