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Advances in transportation helped build America's industrial economy. (n.d.). Retrieved from https://newsela.com/read/natgeo-transportation-19th-century-economy/id/51127/
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Boyd, C. D. (2011). Growth of a nation. Boston, MA: Scott Foresman/Pearson.
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Takaki, R. (2012).A different mirror for young people. A history of multicultural America.
NewYork, NY: Seven Stories Press.
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