Answer:The increased demand for cheap housing by urban migrants led to poorly built homes that inadequately provided for personal hygiene. Immigrant workers in the nineteenth century often lived in cramped tenement housing that regularly lacked basic amenities such as running water, ventilation, and toilets.
Explanation:
<span>Control infectious diseases because in the early 1900s in the United States, many major health threats were infectious diseases associated with poor hygiene and poor sanitation (e.g., typhoid), diseases associated with poor nutrition (e.g., pellagra and goiter), poor maternal and infant health, and diseases or injuries associated with unsafe workplaces or hazardous occupations.</span>
They moved to escape religious discrimination, so they could practice their beliefs safely.
<span>The humans finally got the chance to concentrate on other things besides food to make great scientific discoveries and inventions.otherwise they were hunting and gathering food most of the time.the agricultural revolution also taught them methods to preserve food to be used later.</span>
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The answer is Imperialism.
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