Final answer:
The discovery of gold at Sutter's Mill in 1848 led to the California Gold Rush, causing a significant impact on the social, economic, and political landscape of California and the United States.
Step-by-step explanation:
The discovery of gold at Sutter's Mill in California in 1848 resulted in a major gold rush known as the California Gold Rush. Thousands of people from around the world flocked to California in search of gold, leading to a massive influx of settlers and the rapid development of towns and cities. This event significantly impacted the social, economic, and political landscape of California and the United States as a whole, helping to fuel westward expansion and contributing to the country's economic growth.
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