California Gold Rush Timeline

In January 1847, nine months into the Mexican–American War, the Treaty of Cahuenga was signed, leading to the resolution of the military conflict in Alta California (Upper California).

Image source: Treaty of Cahuenga

With the signing of the treaty ending the war on February 2, 1848, California became a possession of the United States, but it was not a formal 'territory' and did not become a state until September 9, 1850.

Image source: Treaty of Guadalupe Hidalgo

On December 5, 1848, US president James K. Polk confirmed the discovery of gold in California in an address to Congress, igniting national excitement and accelerating migration westward.

Image source: James K. Polk

In 1849, a state constitution was written as California moved rapidly toward organized government amid its explosive population growth.

Image source: Constitution of California

In September 1850, California achieved statehood as the 31st state of the United States through the Compromise of 1850. The sudden population increase allowed California to grow rapidly into statehood.

Image source: Compromise of 1850

With the building of the San Francisco Mint in 1854, gold bullion was turned into official United States gold coins for circulation, integrating gold rush wealth into the national economy.

Image source: San Francisco Mint

Within a few years after the end of the gold rush, in 1863, the groundbreaking ceremony for the western leg of the first transcontinental railroad was held in Sacramento, connecting California to the East.

Image source: First transcontinental railroad

By 1869, railroads were built from California to the eastern United States, ending the isolation that had defined the state since the gold rush era.

The first people to rush to the goldfields, beginning in the spring of 1848, were the residents of California themselves—primarily agriculturally oriented Americans and Europeans living in Northern California, along with Native Californians and some Californios.

By the end of 1848, some 6,000 Argonauts had come to California seeking their fortunes in the goldfields.

By the beginning of 1849, word of the gold rush had spread around the world, and an overwhelming number of gold-seekers and merchants began to arrive from virtually every continent.

The largest group of forty-niners in 1849 were Americans from the East Coast, arriving by the tens of thousands overland across the continent and along various sailing routes. The term 'forty-niner' was derived from the year 1849, the peak year for gold rush immigration.

Gold-seekers and merchants from Asia, primarily from China, began arriving in 1849, at first in modest numbers to Gum San ('Gold Mountain'), the name given to California in Chinese.

Image source: History of Chinese Americans

It is estimated that approximately 90,000 people arrived in California in 1849—about half by land and half by sea—seeking fortune in the goldfields.

Of the 40,000 people who arrived by ship to the San Francisco Bay in 1849, only 700 were women (including those who were poor, wealthy, entrepreneurs, prostitutes, single, and married).

The first missionary to arrive during the gold rush was William Taylor, who arrived in San Francisco in September 1849 to minister to the booming population.

Image source: William Taylor (missionary)

The first immigrants from Europe, reeling from the effects of the Revolutions of 1848 and with a longer distance to travel, began arriving in late 1849, mostly from France, with some Germans, Italians, and Britons.

The population of San Francisco increased quickly from about 1,000 in 1848 to 25,000 full-time residents by 1850, transforming it into a major boomtown.

Image source: San Francisco

Several hundred Chinese arrived in California in 1849 and 1850, and in 1852 more than 20,000 landed in San Francisco, dramatically increasing Chinese presence in the goldfields.

The Panama Railway, spanning the Isthmus of Panama, was finished in 1855, greatly speeding travel between the eastern United States and California.

Image source: Panama Canal Railway

By 1855, it is estimated at least 300,000 gold-seekers, merchants, and other immigrants had arrived in California from around the world, marking the end of the gold rush period (1848–1855).

Chilean miners are known to have resisted eviction by various means, both legal and by the use of revenge attacks culminating in the Chile War of 1849.

The new California State Legislature passed a foreign miners tax of twenty dollars per month ($770 per month as of 2025), and American prospectors began organized attacks on foreign miners, particularly Latin Americans and Chinese. Taxes such as this targeted mainly Latino miners and kept them from making as much money as whites, who had no taxes imposed on them.

Passed on April 22, 1850, by the California Legislature, this act allowed settlers to capture and use Native people as bonded workers, prohibited Native peoples' testimony against settlers, and allowed the adoption of Native children by settlers, often for labor purposes.

Image source: Act for the Government and Protection of Indians

In 1851, eighteen treaties were signed between tribal leaders and federal agents, but California stood in opposition to ratifying them, leaving many tribes without recognized lands.

Image source: California genocide

During the 1852 Bridge Gulch Massacre, a group of settlers attacked a band of Wintu Indians in response to the killing of a citizen named J. Nicholson, exemplifying the violence against indigenous peoples during the era.