1864

The U.S. Senate passed, 38-6, the 13th Amendment to the U.S. Constitution abolishing slavery. (The House of Representatives passed it in January 1865; the amendment was ratified and adopted in December 1865.)

1913

The 17th Amendment to the Constitution was ratified, providing for election of U.S. senators by state residents as opposed to state legislatures.

2010

President Barack Obama and Russian President Dmitry Medvedev signed the New START nuclear arms reduction treaty in Prague.

— From wire reports