Slavery was abolished in the United States on December 6, 1865, the day the Thirteenth Amendment to the Constitution was ratified.1National Archives. 13th Amendment to the U.S. Constitution: Abolition of Slavery That is the date the practice ended as a matter of national law. Two earlier dates often get mentioned in the same conversation, and one later date, but only ratification of the Thirteenth Amendment ended slavery everywhere in the country at once.
The Thirteenth Amendment Ended Slavery Nationwide
Congress passed the Thirteenth Amendment on January 31, 1865. It was ratified on December 6, 1865, once three-fourths of state legislatures approved it.2National Archives. Constitutional Amendment Process The text bans slavery and involuntary servitude anywhere in the United States, with one narrow carve-out for punishment after a criminal conviction.
Putting the ban in the Constitution rather than in an ordinary statute matters. A future Congress cannot repeal it by simple majority; undoing it requires the same supermajority that enacted it. The amendment also gave Congress explicit power to write enforcement laws, which is the constitutional foundation for federal anti-trafficking statutes still on the books.3Library of Congress. U.S. Constitution – Thirteenth Amendment
Ratification is also the date that freed more than 100,000 people in border states like Kentucky and Delaware. Those states had stayed loyal to the Union during the Civil War, and no earlier order applied to them. Until December 6, 1865, slavery there was still legal.
Why the Emancipation Proclamation Is Not the Answer
President Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863, declaring free all people held in slavery within states then in rebellion against the federal government.4National Archives. Emancipation Proclamation (1863) Lincoln issued it as a military order under his authority as Commander-in-Chief, and that limited its reach. It did not apply to loyal border states, and it did not apply to territory already back under Union control.5National Archives. The Emancipation Proclamation
The proclamation also depended on Union troops arriving in person to make its declaration real. In Confederate territory that federal forces had not reached, enslaved people remained in bondage regardless of what the order said. Everyone involved understood that a wartime executive order could not be the final word. A constitutional amendment was.
Juneteenth and the Gap Between Law and Enforcement
Even the Emancipation Proclamation’s limited reach took years to enforce in the more distant parts of the Confederacy. On June 19, 1865, Union Major General Gordon Granger arrived in Galveston, Texas, and issued General Order No. 3 informing Texans that all enslaved people were free.6National Archives. National Archives Safeguards Original Juneteenth General Order That was more than two years after Lincoln’s proclamation, and it happened because federal troops finally had a physical presence to compel compliance.
June 19 became known as Juneteenth. Black communities have marked the day since the 1860s. In 2021, President Biden signed the Juneteenth National Independence Day Act, making it a federal holiday, the first new one established since Martin Luther King Jr. Day in 1983.7GovInfo. Public Law 117-17 – Juneteenth National Independence Day Act Juneteenth marks the enforcement of freedom in Texas, not the legal end of slavery nationwide; that came six months later with ratification.
The 1808 Ban on the International Slave Trade Is a Separate Date
One date that sometimes gets confused with abolition is January 1, 1808, when the Act Prohibiting Importation of Slaves took effect. That was the earliest date the Constitution allowed Congress to restrict the international slave trade.8GovInfo. 2 Stat. 426 – An Act to Prohibit the Importation of Slaves The law imposed fines up to $20,000, five to ten years in prison for bringing captives into the country for sale, and seizure of the ships involved.9Library of Congress. U.S. Statutes at Large – 2 Stat. 426
The 1808 law did nothing about slavery inside the United States. It restricted the arrival of newly captured people from abroad while leaving the domestic institution completely intact. The internal slave trade continued for another 57 years. So slavery was not abolished in 1808; only the foreign supply was.
The Exception Clause Still in the Constitution
The Thirteenth Amendment’s abolition is not quite absolute on the page. Its text bans slavery and involuntary servitude “except as a punishment for crime.”3Library of Congress. U.S. Constitution – Thirteenth Amendment After ratification, Southern states used that phrase to justify Black Codes that criminalized vague offenses like vagrancy, then leased the resulting convicts to private employers for agricultural and industrial labor. Convict leasing as an official system persisted into the early twentieth century.
The exception clause is still in the Constitution today. Incarcerated people across the country perform institutional labor, sometimes for little or no pay. Several states have passed ballot measures in recent years to strike similar language from their own state constitutions. None of that changes the answer to when slavery was abolished at the federal level. That date is December 6, 1865.