1872–73 United States Senate elections
The 1872–73 United States Senate elections were held on various dates in various states, coinciding with President Ulysses S. Grant's re-election. 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 — 1872–73 United States Senate elections (CC BY-SA 4.0)