1876–77 United States Senate elections
The 1876–77 United States Senate elections were held on various dates in various states, coinciding with Rutherford B. Hayes's narrow election as president. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures.
Source: Wikipedia — 1876–77 United States Senate elections (CC BY-SA 4.0)