Another consequence of the Mexican defeat was that California gold poured into American, not Mexican, pockets. In January 1848, James Marshall discovered gold in the American River in the foothills of the Sierra Nevada. His discovery set off the California gold rush, one of the wildest mining stampedes in the world’s history. Between 1849 and 1852, more than 250,000 “forty-niners,” as the would-be miners were known, descended on the Golden State. In less than two years, Marshall’s discovery transformed California from foreign territory to statehood.

Gold fever quickly spread around the world. A flood of men of various races and nationalities poured into California, where they remade the quiet world of Mexican ranches into a raucous, roaring mining town economy. Only a few struck it rich, and life in the goldfields was nasty, brutish, and often short. The prospectors who filled Hangtown, Hell’s Delight, Gouge Eye, and a hundred other crude mining camps faced cholera and scurvy, exorbitant prices for food (eggs cost a dollar apiece), deadly encounters with claim jumpers, and endless backbreaking labor. (See “Analyzing Historical Evidence: The Gold Rush.”)

By 1853, San Francisco had grown into a raw, booming city of 50,000 that depended as much on gold as did the mining camps inland. Enterprising individuals learned that there was money to be made tending to the needs of miners. Hotels, saloons, restaurants, laundries, brothels, and stores of all kinds exchanged goods and services for miners’ gold dust and nuggets. Violent crime was an everyday occurrence. In 1851, the Committee of Vigilance determined to bring order to the city. Members pledged that “no thief, burglar, incendiary or assassin shall escape punishment, either by the quibbles of the law, the insecurity of prisons, the carelessness or corruption of the police, or a laxity of those who pretended to administer justice.” Lynchings proved the committee meant business.

Establishing civic order was made more difficult by California’s diversity and Anglo bigotry. The Chinese attracted special scrutiny. By 1851, 25,000 Chinese lived in California, and their religion, language, dress, queues (long pigtails), eating habits, and use of opium convinced many Anglos that they were not fit citizens of the Golden State. In 1850, the California legislature passed the Foreign Miners’ Tax Law, which levied high taxes on non-Americans to drive them from the goldfields, except as hired laborers working on claims owned by Americans. The Chinese were segregated residentially and occupationally and, along with blacks and Indians, denied public education and the right to testify in court.

Opponents demanded a halt to Chinese immigration, but Chinese leaders in San Francisco fought back. Admitting deep cultural differences, they insisted that “in the important matters we are good men. We honor our parents; we take care of our children; we are industrious and peaceable; we trade much; we are trusted for small and large sums; we pay our debts; and are honest, and of course must tell the truth.” Their protestations offered little protection, however, and racial violence grew.

Anglo-American prospectors asserted their dominance over other groups, especially Native Americans and the Californios, Spanish and Mexican settlers who had lived in California for decades. Despite the U.S. government’s pledge to protect Mexican and Spanish land titles, Americans took the land of the rancheros and through discriminatory legislation pushed Hispanic professionals, merchants, and artisans into the ranks of unskilled labor. Mariano Vallejo, a leading Californio, said of the forty-niners, “The good ones were few and the wicked many.” California’s Indians would have agreed; for them the gold rush was catastrophic.

The forty-niners created dazzling wealth: In 1852, 81 million ounces of gold, nearly half of the world’s production, came from California. However, most miners never struck it rich and eventually took up farming, opened small businesses, or worked for wages for the corporations that took over the mining industry. Other Americans traded furs, hides, and lumber and engaged in whaling and the China trade in tea, silk, and porcelain. Still, as one Californian observed, the state was separated “by thousands of miles of plains, deserts, and almost impossible mountains” from the rest of the Union. Some dreamers imagined a railroad that would someday connect the Golden State with the thriving agriculture and industry of the East. Others imagined a country transformed not by transportation but by progressive individual and institutional reform.