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  "Embargo Act." Image. Lossing, Benson J., The Pictorial Field-Book of the War of 1812, 1868. American History. ABC-CLIO, 2013. Web. 28 Oct. 2013.
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  "Missouri Compromise (1820)." Image. North Wind Picture Archives. American History. ABC-CLIO, 2013. Web. 28 Oct. 2013.
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  "Samuel Morse's sketch of railway telegraph." Image. Library of Congress. American History. ABC-CLIO, 2013. Web. 28 Oct. 2013.
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  "Henry Clay debates the Compromise of 1850." Image. North Wind Picture Archives. American History. ABC-CLIO, 2013. Web. 28 Oct. 2013.