Oligarchy, government by the few, especially despotic power exercised by a small and privileged group for corrupt or selfish purposes. Aristotle used the term oligarchia to designate the rule of the few when it was exercised not by the best but by bad men unjustly.
The California Gold Rush brought some 300,000 people to California from the rest of the United States. Hope this helps!
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The answer is A.1866. 1965 is the most famous one but 1866 was the first