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Poor districts or 'slums' in America used to be terrible. Sickness spread easily in these dwellings due to poor filtration of standing water and waste disposal, along with overcrowded living spaces.
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The Aztecs no longer trusted Montezuma, they were short on food, and the smallpox epidemic was under way. More than 3 million Aztecs died from smallpox, and with such a severely weakened population, it was easy for the Spanish to take Tenochtitlán.Sep 29, 2017
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the answer you're looking for is simply : crowd