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1.5 million pounds in 1790 and 2.25 billion pounds in 1859, based on Empire of Cotton, by Sven Beckert (2014) pgs. 104, 106
77% based on: Cotton and Race in the Making of America: The Human Costs of Economic Power, by Gene Dattel (2009)
Joshua Rothman, email correspondence, 2015
48.3% in 1860 according to Gavin Wright, Slavery and American Economic Development (LSU Press, 2006, paperback 2013) [personal communication]
The Politics of Despair: Power and Resistance in the Tobacco Wars. Tracy Campbell, 2015
7% based on: Documents of the Assembly of the State of New York, Vol. 4. 1979.
$15 trillion: National Legal and Policy Center, http://www.newsmax.com/Newsfront/obama-reparations-black-farmers/2010/02/21/id/350458/