I believe that there are human stocks with whom it is physically unwise to intermarry, but to think that these stocks are all colored or that there are no such white stocks is unscientific and false.
W. E. B. Du BoisThe Negro cannot stand the present reactionary tendencies and unreasoning drawing of the color line indefinitely without discouragement and retrogression. And the condition of the Negro is ever the cause for further discrimination.
W. E. B. Du Bois