From Wikipedia, the free encyclopedia.
Centuries: 18th century - 19th century - 20th century
- January 4 - Samuel Colt sells his first revolver pistol to the United States government.
- January 13 - The Treaty of Cahuenga ends the Mexican-American War in California.
- January 16 - John C. Fremont is appointed Governor of the new California Territory.
- January 30 - Yerba Buena, California is renamed San Francisco.
- February 19 - The Donner Party is rescued. It is noted that some of the survivors seem to be remarkably well-fed considering their ordeal.
- February 22 - Mexican-American War: The Battle of Buena Vista - 5,000 American troops under General Zachary Taylor use their superiority in artillery to drive off 15,000 Mexican troops under Antonio Lopez de Santa Anna defeating the Mexicans the next day.
- March 9 - Mexican-American War: United States forces under General Winfield Scott invade Mexico near Veracruz.
- March 29 - Mexican-American War: United States forces led by General Winfield Scott take Veracruz after a siege.
- May 7 - In Philadelphia, the American Medical Association (AMA) is founded.
- July 1 - The United States issues its first postage stamps.
- July 24 - After 17 months of travel, Brigham Young leads 148 Mormon pioneers into Salt Lake Valley, resulting in the establishment of Salt Lake City.
- July 26 - Liberia gains independence.
- September 6 - Henry David Thoreau leaves Walden Pond and moves in with Ralph Waldo Emerson and his family in Concord, Massachusetts.
- October 12 - German inventor and industrialist Werner von Siemens founds Siemens AG & Halske.
- Mexican-American War (1846-1848)