Nothing is more certainly written in the book of fate than that these people [negros] are to be free. Nor is it less certain that the two races, equally free, cannot live in the same government. Nature, habit, opinion has drawn indelible lines of distinction between them. It is still in our power to direct the process of emancipation, and deportation, peaceably, and in such slow degrees, as that the evil will wear off insensibly; and their places be, pari passu, filled up by free white laborers. If, on the contrary, it is left to force itself on, human nature must shudder at the prospect held up. -https://en.wikipedia.org/wiki/Thomas_Jefferson_and_slavery
Rather conflicts with the narrative that the US was founded as a melting pot nation.