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"Frontier Myth." Wikipedia. Wikipedia, 8 Oct. 2016. Web. 12 Dec. 2016. <https://en.wikipedia.org/wiki/Frontier_myth>.
"American History: Settlers Rush to Claim Western Land." VOA. VOA, 14 Apr. 2014. Web. 12 Dec. 2016. <http://learningenglish.voanews.com/a/american-history-series-settlers-rush-to-claim-western-land-90841054/115787.html>.
"The Gold Rush of 1849." History. History, 2010. Web. 12 Dec. 2016. <http://www.history.com/topics/gold-rush-of-1849>.
Griffith, Shirley. "American History: Settlers Rush to Claim Western Land." VOA. Learning English, n.d. Web. 11 Dec. 2016.
"The Pacific Railway." A Brief History of the Pacific Railway - The Transcontinental Railroad. Transcontinental Railroad, n.d. Web. 12 Dec. 2016. <http://railroad.lindahall.org/essays/brief-history.html>.
Duyne, Van. "Western Settlement Alternative Activity." Western Settlement Alternative Activity. N.p., n.d. Web. 11 Dec. 2016.
Moffatt Economics Expert, Mike. "The Cotton Gin, the Western Frontier, and the Early American Economy." About.com Education. About Education, 28 Oct. 2015. Web. 12 Dec. 2016. <http://economics.about.com/od/useconomichistory/a/economic_grow.htm>.
"Primary Documents in American History." Indian Removal Act: Primary Documents in American History (Virtual Programs & Services, Library of Congress). Library of Congress, n.d. Web. 12 Dec. 2016. <https://www.loc.gov/rr/program/bib/ourdocs/Indian.html>.
"Native Americans." The West 1850-1890. N.p., n.d. Web. 11 Dec. 2016.
Crashcourse. "Westward Expansion: Crash Course US History #24." YouTube. YouTube, 08 Aug. 2013. Web. 11 Dec. 2016.