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The California Gold Rush of 1849-1855 revolutionized California, the United States and the world. It prompted one of the largest immigration activities in the history of the United States. Hundreds of thousands of immigrants from the United States and the world came to California in search of gold in the foothills of the Sierra Nevada Mountains. This led to the establishment of new cities, rapid economic growth and prosperity, and the construction of railways, churches and banks to accommodate new immigrants. The significant increase in population and infrastructure enabled California to qualify as a Mexican state in 1850, only a few years after Mexico was ceded, and promoted the expansion of the United States into the western United States. The California Gold Rush occurred in the context of the Industrial Revolution, which was a promoter of American economic development in the 19th century.

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