Question: Which institute was opened earlier, Psychiatric Institute of Washington or St. Elizabeths Hospital?

Context paragraphs:
Loreta Janeta Velázquez: Loreta Janeta Velázquez (June 26, 1842 – 1923), was a Cuban-born woman who masqueraded as a male Confederate soldier during the American Civil War.  After her soldier husband's accidental death, she enlisted in the Confederate States Army in 1861.  She then fought at Bull Run, Ball's Bluff, and Fort Donelson, but was discharged when her gender was discovered while in New Orleans.  Undeterred, she reenlisted and fought at Shiloh, until unmasked once more.  She then became a Confederate spy, working in both male and female guises, and as a double agent also reporting to the U.S. Secret Service.  She remarried three more times, being widowed in each instance.  According to William C Davis, she died in January 1923 under the name Loretta J. Beard after many years away from the public eye in a public psychiatric facility, St. Elizabeths Hospital.  She spied on the Union for about 5 years.

Visits to St. Elizabeths: Visits to St Elizabeths is a poem by Elizabeth Bishop modelled on the English nursery rhyme "This is the house that Jack built".  The poem refers to the confinement between 1945 and 1958 of Ezra Pound in St Elizabeths Hospital, Washington, D.C.  The nursery rhyme style gives an unusual effect to the strange or unsettling descriptions of a psychiatric hospital in the poem.  Likewise the poem treats Pound ambivalently describing him by turns as "honored", "brave", "cruel", and "wretched" among other things.

Southeast, Washington, D.C.: Southeast (SE or S.E.) is the southeastern quadrant of Washington, D.C., the capital of the United States, and is located south of East Capitol Street and east of South Capitol Street.  It includes the Capitol Hill and Anacostia neighborhoods, the Navy Yard, the Joint Base Anacostia-Bolling (JBAB), the U.S. Marine Barracks, the Anacostia River waterfront, Eastern Market, the remains of several Civil War-era forts, historic St. Elizabeths Hospital, RFK Stadium, Nationals Park, and the Congressional Cemetery.  It is also contains a landmark known as "The Big Chair," located on Martin Luther King Avenue.  The quadrant is bisected by the Anacostia River, with the portion that is west of the river sometimes referred to as "Near Southeast".

Barry Farm: Barry Farm is a neighborhood in Southeast Washington, D.C., located east of the Anacostia River and is bounded by the Southeast Freeway to the northwest, Suitland Parkway to the northeast and east, and St. Elizabeths Hospital to the south.  The neighborhood was renowned as a significant post-Civil-War settlement of free Blacks and freed slaves established by the Freedmen's Bureau.  The streets were named to commemorate the Union generals and Radical Republicans who advanced the rights of black Americans during the Civil War and Reconstruction: Howard Road SE for General Oliver O. Howard; Sumner Road SE for Massachusetts Senator Charles Sumner; Wade Road SE for Ohio Senator Benjamin Wade; Pomeroy Road SE for Kansas Senator Samuel C. Pomeroy; and Stevens Road SE for Pennsylvania Congressman Thaddeus Stevens.  The neighborhood name is not a reference to the late former mayor of Washington, D.C., Marion Barry, but coincidentally has the same spelling.

Congress Heights: Congress Heights is a residential neighborhood in southeast Washington, D.C., in the United States.  The irregularly shaped neighborhood is bounded by the St. Elizabeths Hospital campus, Lebaum Street SE, 4th Street SE, and Newcomb Street SE on the northeast; Shepard Parkway and South Capitol Street on the west; Atlantic Street SE and 1st Street SE (as far as Chesapeake Street SE) on the south; Oxon Run Parkway on the southeast; and Wheeler Street SE and Alabama Avenue SE on the east.  Commercial development is heavy along Martin Luther King, Jr.  Avenue and Malcolm X Avenue.

St. Elizabeths Hospital: St. Elizabeths Hospital opened in 1855 as the first federally operated psychiatric hospital in the United States.  Housing over 8,000 patients at its peak in the 1950s, the hospital at one point had a fully functioning medical-surgical unit, a school of nursing, and accredited internships and psychiatric residencies.  Its campus was designated a National Historic Landmark in 1990.

Douglass (Washington, D.C.): Douglass is a residential neighborhood in Southeast Washington, D.C., on the eastern side of St. Elizabeths Hospital, on the border of the Congress Heights Metro Station.  It is bounded by Suitland Parkway to the north and east, Alabama Avenue to the south, and the St. Elizabeths campus to the west.

Congress Heights station: Congress Heights is an island platformed Washington Metro station in the Congress Heights neighborhood of Washington, D.C., United States.  The station was opened on January 13, 2001, and is operated by the Washington Metropolitan Area Transit Authority (WMATA).  Providing service for only the Green Line, the station is located at Alabama Avenue and 13th Street, lying under St. Elizabeths Hospital.  Congress Heights is the last Green Line station in the District of Columbia going southeast.

Psychiatric Institute of Washington: The Psychiatric Institute of Washington (PIW) is an acute (104 bed) psychiatric hospital in Washington, D.C. Opened in 1967, PIW is a short-term, private hospital.  It offers behavioral healthcare to patients suffering from mental and addictive illnesses, including children, adolescents, adults and the elderly.  Services offered by PIW include inpatient, partial and intensive outpatient hospitalization, and group treatment programs for substance abuse and addiction.

Winfred Overholser: Winfred Overholser (1892 – October 6, 1964) was an American psychiatrist, president of the American Psychiatric Association, and for 25 years the superintendent of St. Elizabeths Hospital, a federal institution for the mentally ill in Washington, D.C.

Supporting paragraphs: Psychiatric Institute of Washington St. Elizabeths Hospital
Answer: St. Elizabeths Hospital