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most of Massachusetts and Rhode Island become urbanized
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a railroad was built conecting cost to coast
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most of New york becomes urbanized
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rockefeller oil company was founded
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electric light bulb was created
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Washington, D.C. is completly urbanized
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Carnegie Steel Company first steel plant
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Automobile was invented
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most of The Midwestern and Western United States became urbanized
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80.7% of United States is urbanized
