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In 1965, Congress passed the Immigration and Nationality Act, which eliminated restrictions racial, ethnic, and national origin restrictions on immigration and established priority immigration procedures for family reunification.
The U.S. Senate unanimously voted to pass what would become the 26th Amendment, lowering the voting age to 18.
On the final day of John Tyler's presidency, a broad coalition overrode his veto on a minor bill related to customs enforcement -- the first time congress ever overrode a presidential veto.
In 1866, the House voted 105-20 to try former Confederate President Jefferson Davis for treason -- the trial ultimately never occurred.