Why did people come to California to search for gold?

When James Marshall first discovered gold in California, he wanted to keep the news quiet. He had the gold tested and verified before making the claim that he had found it. Thousands of people flocked to the area, and then the miners were nicknamed 49ers

Explanation:

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if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic