The answer is A. driving out non-Christian groups
Indians had no immunity to European diseases
This fact was one of the main causes for the decimation of the Native American population. The Indians simply never encountered the European diseases and their bodies had not antibodies to fight them off.
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These tenements were for poor immigrants that just came to the United States to start a better life. These tenements were overcrowded, unsanitary, and unsafe housing. At least 18 people lived in one tenement apartment. There were only two toilets stalled on each floor and one bathtub in the kitchen of the apartment.