Charles Francis Adams, "The Era of Change," in Charles F. Adams and Henry Adams, Chapters of Erie and Other Essays (Boston: James Osgood, 1871; reprint, New York: Augustus M. Kelley, 1967), 365.
The best of these are by Maury Klein; see esp. Klein, Union Pacific
Maury Klein, Union Pacific, (Garden City, N.Y.: Doubleday, 1987).
Gerald Berk, a political scientist, has recognized this, as has William Roy, a historical sociologist.
William Roy, Socializing Capital: The Rise of the Large Industrial Corporation in America, (Princeton: Princeton Univ. Press, 1997), 95;
Quote, Adams to Moorfield Storey, Feb. 2, 1885, UP, PO, OC, vol. 27, ser. 2, r. 23;
for policies during the Civil War, Heather Cox Richardson, The Greatest Nation of the Earth: Republican Economic Policies during the Civil War (Cambridge: Harvard Univ. Press, 1997), 170-72, 175, 178-80.