The document discusses the California Gold Rush of 1848-1855. It describes how gold was discovered by James Marshall at Sutter's sawmill, sparking a massive migration. Over 300,000 prospectors immigrated to California using various mining techniques like pans, picks and shovels to excavate gold. Some individuals like Wells and Levi Strauss profited by supplying goods and services to the miners. The Gold Rush had positive impacts like growing California's population and economy but also had negative effects like environmental impacts and violence towards native peoples.