Answer: The California Gold Rush of 1849-1855 radically transformed California, the United States and the world. ... The significant increase in population and infrastructure allowed California to qualify for statehood in 1850, only a few years after it was ceded by Mexico, and facilitated U.S. expansion to the American West.
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They work for dirt cheap, and work hard because they want to keep the work they receive, an immigrants usual only hope is a steady work whether or not they're illegal.