The California Gold Rush began in 1848 when gold was discovered at Sutter's Mill, sparking a major migration of people seeking wealth. Over 300,000 people immigrated to California from around the world, traveling by dangerous sea voyages or covered wagon along western trails. While some struck riches, many prospectors found only hardship. The rush had severe impacts, such as disease and violence against native peoples, but also established new communities and infrastructure that ultimately led to California statehood.