What might have been one of the biggest geographic influences on mesoamerican civilizations?

One of the biggest geographic influences on Mesoamerican civilizations might have been the highlands. The high peaks that surround the valleys where indigenous cultures developed, made rain a rare event, so they had to think about a way of storing water. By struggling to make the most of essential natural resources, the identity of such groups was forged and it allowed it to grow and to strengthen as a civilization.

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

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answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;