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Congress created the Freedmen’s Bureau with an act on March 3, 1865, expecting the Bureau’s work to be complete within a year. In 1866, realizing the Bureau would require more time, Congress passed a bill extending its term and increasing its powers. President Andrew Johnson vetoed the bill, but both the House and Senate overrode his veto on July 16, 1866.
Records of the U.S. Senate, National Archives and Records Administration