I think its the availability of good jobs in the North and West.
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The Olmec civilization was located in "MesoAmerica," since they were located in an area that is now part of present-day Mexico (although the borders are significantly different now).
most standardized test are passages and multiple choice, but it'll help a lot if you have like context/ background info to help you accurately answer them.
A. Have illusions and hallucinations
