题目内容
It took Americans a century and a half to expand as far west as the Appalachian Mountains.
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Among the common motivations of moving westward are finding great wealth and practicing religion without government intervention.
James W. Marshall was the first person to discover a gold mine in California.
The vast majority of those who arrived in California were Americans.
The Gold Rush transformed California from a sleepy society into one that was wild, unruly, ethnically-diverse, and violent.
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