<span>Most did not strike it rich, but they remained in California and bettered the state's infrastructure. This was because they were a ready labor force, and the amount of gold in the gold fields had been wildly exaggerated. There just was not enough gold for all of the forty niners to strike it rich.</span>
I'd say it's <span>b.)They demanded an end to Jewish immigration.
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Your answer is the first one. Domestic Servant, Skilled Trades, and field workers.
