There is some controversy over whether or not the sloop was a new ship, or a rebuilt version of the frigate. The position that they were the same ship relies on three main points:
In any case, the sloop was launched 26 August 1854, and commissioned 28 July 1855.
Constellation's first assignment was interdicting the African slave trade. She captured three slave ships and released the imprisoned slaves. At the outbreak of the Civil War, she made the first Union Navy capture, overpowering the slaver brig Triton in African coastal waters.
After the war, Constellation saw various duties such as carrying famine relief stores to Ireland and carrying American works of art to the Paris Exposition of 1895.
After being used as a practice ship for US Naval Academy midshipmen, Constellation became a training ship in 1894 for the Naval Training Center in Newport, Rhode Island, where she helped train more than 60,000 recruits during World War I.
Decommissioned in 1933, Constellation was recommissioned as a national symbol in 1940 by President of the United States Franklin Roosevelt. Shortly after the US's entry into World War II, she became the flagship for Admiral Ernest J. King and Vice Admiral Royal Ingersoll.
Constellation was again decommissioned on 4 February 1955, and stricken from the Naval Vessel Register on 15 August 1955 -- about two weeks and one hundred years from her first commissioning. She was taken to her permanent berth -- Constellation Dock, Inner Harbor at Pier 1, 301 East Pratt Street, Baltimore, Maryland -- and declared a National Historic Landmark (reference number 66000918) on 23 May 1963. she is the last existing American Civil War-era naval vessel and the last sail-powered warship built by the US Navy. She has been assigned the hull classification symbol IX-20.
Constellation completed a $9-million restoration project in July 1999.