How has the refrigerated railroad changed over time?

It was more efficient to slaughter the cattle in Chicago and ship the carcasses to the East, rather than send live cattle east by rail, carcasses could only be shipped during the cold winter months

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

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