The first session of the 39th Congress is sitting at the capital from December 4 to December 21, 1865

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Although it did not actually meet over the long weekend of December 6-11, 1865, the first session of the Thirty-ninth Congress of the United States was sitting in Washington. The House sat for only two weeks before its holiday recess started on December 21, 1865. Schuyler Colfax of Indiana was in the Speaker's chair. (By John Osborne)
Source Citation
Office of the Clerk, U.S. House of Representatives, "House History."  http://clerk.house.gov/art_history/house_history/index.html
    Date Certainty
    Exact
    Type
    Legal/Political
    How to Cite This Page: "The first session of the 39th Congress is sitting at the capital from December 4 to December 21, 1865," House Divided: The Civil War Research Engine at Dickinson College, https://hd.housedivided.dickinson.edu/index.php/node/21958.