1846 – President James K. Polk asks for a Declaration of War against Mexico, starting the Mexican-American War. It is approved on May 13.
1858 – Minnesota is admitted as the 32nd state.
1910 – An act of Congress establishes Glacier National Park in Montana.
1973 – Citing government misconduct, Daniel Ellsberg’s charges for his involvement in releasing the Pentagon Papers to the New York Times are dismissed.
1997 – World chess champion Gary Kasparov was defeated by a computer, IBM’s Deep Blue, in a six-game match.
