61
Fogel, Railroads and American Economic Growth.
62
McDougall, Throes of Democracy, 143.
63
Howe, What Hath God Wrought, 695.
64
Richard White, Railroaded: The Transcontinentals and the Making of Modern America (New York: W. W. Norton, 2011), 37.
65
Wiebe, Self-Rule, 56.
66
McDougall, Freedom Just Around the Corner, 178–179.
67
Michael Haines, ed., "Population Characteristics", Population, vol. 1 of Historical Statistics of the United States: Millennial Edition, 21.
68
Sutch, "National Income and Product", Economic Structure and Performance, vol. 3 of Historical Statistics of the United States: Millennial Edition, 17.
