Cato, no. 3. The Founders' Constitution. Volume 1, Chapter 4, Document 16. University of Chicago Press. Retrieved January 22, 2011.
Letter by Madison to Jefferson, October 24, 1787. "James Madison to Thomas Jefferson". The Founders' Constitution. Volume 1, Chapter 17, Document 22. University of Chicago Press. Retrieved January 22, 2011.
Montesquieu, Spirit Of Laws, ch. xvi. vol. I, book VIII, cited in Brutus, No. 1. The Founders' Constitution. Volume 1, Chapter 4, Document 14. University of Chicago Press. Retrieved January 22, 2011.
Brutus, No. 1. The Founders' Constitution. Volume 1, Chapter 4, Document 14. University of Chicago Press. Retrieved January 22, 2011. "History furnishes no example of a free republic, any thing like the extent of the United States. The Grecian republics were of small extent; so also was that of the Romans. Both of these, it is true, in process of time, extended their conquests over large territories of country; and the consequence was, that their governments were changed from that of free governments to those of the most tyrannical that ever existed in the world".
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Ransom, Roger L. "Economics of the Civil War". Economic History Association. August 24, 2001. Referenced November 20, 2005. Citing Beard; Hacker; Egnal; Ransom and Sutch; Bensel; and McPherson, Ransom notes that "regional economic specialization ... generated very strong regional divisions on economic issues ... economic changes in the Northern states were a major factor leading to the political collapse of the 1850s ... the sectional splits on these economic issues ... led to a growing crisis in economic policy".
