"A black man, Benjamin Banneker, who taught himself mathematics and astronomy, predicted accurately a solar eclipse, and was appointed to plan the new city of Washington, wrote to Thomas Jefferson: I suppose it is a truth too well attested to you, to need a proof here, that we are a race of beings, who have long labored under the abuse and censure of the world; that we have long been looked upon with an eye of contempt; and that we have long been considered rather as brutish than human, and scarcely capable of mental endowments I apprehend you will embrace every opportunity to eradicate that train of absurd and false ideas and opinions, which so generally prevails with respect to us; and that your sentiments are concurrent with mine, which are, that one universal Father hath given being to us all; and that he hath not only made us all of one flesh, but that he hath also, without partiality, afforded us all the same sensations and endowed us all with the same facilities. . . . Banneker asked Jefferson "to wean yourselves from those narrow prejudices which you have imbibed." Jefferson tried his best, as an enlightened, thoughtful individual might. But the structure of American society, the power of the cotton plantation, the slave trade, the politics of unity between northern and southern elites, and the long culture of race prejudice in the colonies, as well as his own weaknesses--that combination of practical need and ideological fixation--kept Jefferson a slaveowner throughout his life."