24 Jan 1848: California Gold Rush begins,Gold was discovered at Sutter's Mill, California, triggering a massive migration of "forty-niners."
24 Jan 1848: Gold discovered in California,James W. Marshall discovered gold at Sutter's Mill in Coloma, California, beginning the California Gold Rush.
2 Feb 1848: Treaty of Guadalupe Hidalgo,The treaty was signed, ending the Mexican-American War and ceding significant territory to the United States.
2
1850
9 Sep 1850: Compromise of 1850,A series of five bills passed to address the issue of slavery, including admitting California as a free state and enacting the Fugitive Slave Act.
3
1852
20 Mar 1852: Uncle Tom's Cabin published,Harriet Beecher Stowe's anti-slavery novel was published, becoming a bestseller and fueling the abolitionist movement.