In 1848, a discovery completely transformed the trajectory of the state.
A worker at John Sutter's mill in the foothills of the Sierra Nevada, stumbled upon a nugget of gold.
This sparked the beginning of the Gold Rush, a momentous episode in the history of the United States.
During the Gold Rush, 300,000 people flocked to California.
Half of the immigrants came by sea, which lead to San Francisco increasing from 200 to 36,000 residents.
Immigrants came from all over the world - Latin America, Europe, Australia, China... to try their luck.
They became called "forty-niners" after 1849.
As the ships sailed them into San Francisco, many of them were then abandoned and converted into homes, stores, taverns, landfill... as it was too expensive to sail them back.