On a visit to Washington, DC, in 1836, the sight of a slave auction held in the shadow of the Capitol convinced future senator Henry Wilson of Massachusetts to “give all that I had to the cause of emancipation.” Elected to a Senate seat in 1855, Wilson became a leading voice for the abolition of slavery during the Civil War. Throughout the war years, the Senate operated, according to Senator John Sherman of Ohio, like “a laborious committee where bills are drawn as well as discussed.” In addition to fulfilling legislative responsibilities and accomplishments such as funding the war effort and providing for Union troops during this period, a group of elected officials known as the Radical Republicans demanded the abolition of slavery. Many senators believed that only the president had the power to emancipate slaves in the states, but as Senator Sherman explained, “Little doubt was felt as to the power of Congress to abolish slavery in the District.” On April 3, 1862, the Senate passed the District of Columbia Compensated Emancipation Act, originally sponsored by Wilson. Harper’s Weekly reported that the “bill passed by a vote of twenty-nine yeas to fourteen nays. The announcement of the result was received with applause from the galleries.” Two days later, Senator Lafayette Foster of Connecticut proudly declared, “You may strike off the bonds of every slave in the District of Columbia today.”

President Lincoln signed the bill into law on April 16, freeing slaves in the district and compensating owners up to $300 for each freeperson. The Hartford Daily Courant celebrated that, “Not a slave exists in the District of Columbia …Their shackles have fallen, never to be restored.” In the months following the enactment of the law, commissioners approved more than 930 petitions, granting freedom to 2,989 former slaves. “DC Emancipation Day” has been celebrated in the District each year since 1862. Just five months later, in September 1862, using his powers as Commander in Chief, Lincoln announced his intention to emancipate slaves located in states “in rebellion.” On January 1, 1863, the Emancipation Proclamation granted freedom to slaves residing in Confederate states not occupied by Union forces. The Thirteenth Amendment, ratified by the states on December 6, 1865, abolished slavery “within the United States, or any place subject to their jurisdiction.”