“[T]he intelligence and ability of a colored person are in pretty direct proportion to the amount of white blood he has, and … most of the positions of leadership, influence, and prominence in the Negro race are held not by real Negroes but by Mulattoes, many of whom have very little Negro blood.”

The motive is not a desire to elevate the negro, but to humiliate and degrade those of mixed blood; not a desire to bring the negro up, but to cast the mulatto and the quadroon down by forcing him below an arbitrary and hated color line.
1880s, The Future of the Colored Race (1886)

1960s, Address to Local 815, Teamsters and the Allied Trades Council (1967)

1860s, Allow the humblest man an equal chance (1860)
Context: So that saying, "in the struggle between the negro and the crocodile," &c., is made up from the idea that down where the crocodile inhabits a white man can't labor; it must be nothing else but crocodile or negro; if the negro does not the crocodile must possess the earth; [Laughter; ] in that case he declares for the negro. The meaning of the whole is just this: As a white man is to a negro so is a negro to a crocodile; and as the negro may rightfully treat the crocodile, so may the white man rightfully treat the negro. This very dear phrase coined by its author, and so dear that he deliberately repeats it in many speeches, has a tendency to still further brutalize the negro, and to bring public opinion to the point of utter indifference whether men so brutalized are enslaved or not.

1960s, The Role of the Behavioral Scientist in the Civil Rights Movement (1967)

Source: To Kill a Mockingbird

1920s, The Progress of a People (1924)
Context: The armies in the field could not have done their part in the war if they had not been sustained and supported by the far greater civilian forces at home, which through unremitting toil made it possible to sustain our war effort. No part of the community responded more willingly, more generously, more unqualifiedly, to the demand for special extraordinary exertion, than did the members of the Negro race. Whether in the military service, or in the vast mobilization of industrial resources which the war required, the Negro did his part precisely as did the white man. He drew no color line when patriotism made its call upon him. He gave precisely as his white fellow citizens gave, to the limit of resources and abilities, to help the general cause. Thus the American Negro established his right to the gratitude and appreciation which the Nation has been glad to accord.

Source: An American Dilemma (1944), p. 1077. Appendix 5

1860s, What the Black Man Wants (1865)

Wright Jr. 87 Years Behind the Black Curtain: An Autobiography. 1965