Source: "Social Behavior as Exchange," 1958, p. 597; Article abstract
“Negroes belonging to our citizens are not considered subjects of exchange and were not included in my proposition.”
To Ulysses S. Grant on why black U.S. soldiers were not be repatriated by the Confederacy, as quoted in Liberty, Equality, Power: Enhanced Concise Edition https://books.google.com/books?id=1w5Qp4qYfE0C&pg=PA433#v=onepage&q&f=false (2009), California: Cengage Learning, p. 433
1860s
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Robert E. Lee 55
Confederate general in the Civil War 1807–1870Related quotes

Fourth Lincoln-Douglass Debate http://www.nps.gov/liho/learn/historyculture/debate4.htm (September 1858)
1850s

1860s, Speech at Hartford (1860)
Context: The proposition that there is a struggle between the white man and the negro contains a falsehood. There is no struggle. If there was, I should be for the white man. If two men are adrift at sea on a plank which will bear up but one, the law justifies either in pushing the other off. I never had to struggle to keep a negro from enslaving me, nor did a negro ever have to fight to keep me from enslaving him. They say, between the crocodile and the negro they go for the negro. The logical proportion is therefore; as a white man is to a negro, so is a negro to a crocodile; or, as the negro may treat the crocodile, so the white man may treat the negro. The 'don't care' policy leads just as surely to nationalizing slavery as Jeff Davis himself, but the doctrine is more dangerous because more insidious.

2010s, 2016, June, Speech about the Orlando Shooting (June 13, 2016)

2000s, The Logic of the Colorblind Constitution (2004)

Letter to Thomas Wentworth Higginson (1868-01-13).

On The Algebra of Logic (1885)
Context: Any character or proposition either concerns one subject, two subjects, or a plurality of subjects. For example, one particle has mass, two particles attract one another, a particle revolves about the line joining two others. A fact concerning two subjects is a dual character or relation; but a relation which is a mere combination of two independent facts concerning the two subjects may be called degenerate, just as two lines are called a degenerate conic. In like manner a plural character or conjoint relation is to be called degenerate if it is a mere compound of dual characters.
A sign is in a conjoint relation to the thing denoted and to the mind. If this triple relation is not of a degenerate species, the sign is related to its object only in consequence of a mental association, and depends upon a habit. Such signs are always abstract and general, because habits are general rules to which the organism has become subjected. They are, for the most part, conventional or arbitrary. They include all general words, the main body of speech, and any mode of conveying a judgment. For the sake of brevity I will call them tokens.

1860s, Letter to Abraham Lincoln (1863)
Context: I have given the subject of arming the negro my hearty support. This, with the emancipation of the negro, is the heavyest blow yet given the Confederacy. The South rave a greatdeel about it and profess to be very angry. But they were united in their action before and with the negro under subjection could spare their entire white population for the field. Now they complain that nothing can be got out of their negroes.
Source: Amusing Ourselves to Death: Public Discourse in the Age of Show Business