Gold discovered at Sutter’s MillJan 24, 1848Labels: James W, Sutter's Mill, Coloma CaliforniaAP NewsBritannica
Treaty of Guadalupe Hidalgo ends the warFeb 2, 1848Labels: Treaty of, United States, MexicoNational ArchivesBritannica
Treaty proclaimed; California now U.S. territoryJul 4, 1848Labels: Treaty proclamation, United States, California territoryNational Archives
Polk’s annual message publicizes the gold findDec 5, 1848Labels: James K, Presidential Message, U SMiller Center
First major Gold Rush wagon migrations beginJan 1, 1849Labels: Wagon trains, California Trail, Oregon TrailBritannicaWikipedia
Cholera outbreaks hit trail camps along the PlatteJun 1, 1849Labels: Cholera, Platte River, Oregon CaliforniaWikipediaWikipedia
California admitted as the 31st U.S. stateSep 9, 1850Labels: California statehood, Compromise of, State governmentUS House HistorySmithsonian
Fort Laramie Treaty seeks safer travel on the PlainsSep 17, 1851Labels: Fort Laramie, Plains nations, Plains travelNPSWikipedia
Gold production and migration crest around 1852Jan 1, 1852Labels: Gold production, California miners, Migration peakBritannicaU S Mint
Congress authorizes a U.S. branch mint in San FranciscoJul 3, 1852Labels: San Francisco, U S, Branch mintU S MintCA Parks
Gadsden Purchase treaty signed as routes and borders evolveDec 30, 1853Labels: Gadsden Purchase, United States, MexicoNational ArchivesState Historian
San Francisco branch mint opens to accept miners’ goldApr 3, 1854Labels: San Francisco, Coinage, Miners' goldU S MintCA Parks
By 1855, the initial Gold Rush trail-wave largely subsidesJan 1, 1855Labels: Gold Rush, California settlement, Trail transitionBritannicaWikipedia