Lincoln publicly endorsed white supremacy and Black subordination in 1858.

Evidence

“I am not, nor ever have been, in favor of bringing about in any way the social and political equality of the white and black races, I am not nor ever have been in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people; and I will say in addition to this that there is a physical difference between the white and black races which I believe will forever forbid the two races living together on terms of social and political equality,” Lincoln stated. “And inasmuch as they cannot so live, while they do remain together there must be the position of superior and inferior, and I as much as any other man am in favor of having the superior position assigned to the white race.” — Tamara Lanier, From These Roots, 825