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  Population spiked from 30,000 people to 300,000 people.
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  Fire escapes and windows required for every room in a house.
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  Fires destroyed a large portion of major cities.
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  Jacob Riis moved to America from Denmark, working as a reporter for NYC police department. Began project to bring the "lower class" living conditions to light.
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  Most of Chicago was destroyed in this gruesome event spanning two whole days of flames.
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  These new devices helped prevent fires, allowing cities to grow and thrive.
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  Set plumbing and ventilation standards for slums in New York City.
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  Brooklyn was now linked to Manhatten, allowing a much more efficient route between the two, making New York City the urban giant it is today.
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  Charles Stover and Stanton Coit brought settlement houses to America.
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  The New York Sun reveals the living conditions of the poor thanks to Jacob Riis's photos.
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  Jane Addams and Ellen Gates Starr create a settlement house in Chicago.
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  Half as many Irish in Dulbin, Ireland than in New York City
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  Janie Porter Barrett creates Hampton, Virgina's settlement house, Locust Street Social Settlement.
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  Chicago, Detroit, and other NorthWest cities saw influx of 200,000 African Americans who fled racism and poverty in the South.
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  The first electric subways were built in Boston, revolutionizing public transit.
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  By this time, a lot of cities in the US implemented sewers to reduce disease in urban areas.
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  Chlorination allowed efficient cleaning of water, giving safe water to urban civillians.
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  18 major cities in America had more than half of their population comprised of immigrants
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