It had a major contribution by having immigrants go from their home country to the US for the money to move west thanks to the Gold and Silver in California.
<h3>Explanation:</h3>
The reasoning why that is because in San Francisco in 1849 had the<u><em> major Gold Rush and they had Silver for almost 20 years worth of resources of that product.</em></u> The <u>San Francisco Gold Rush in California</u> to lead to migration to westward expansion and left with <u>boom towns</u>.
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