“The degree of ignorance cannot easily be expressed. We may say, for instance, that nearly two-thirds of them cannot read or write. This but partially expresses the fact. They are ignorant of the world about them, of modern economic organization, of the function of government, of individual worth and possibilities,—of nearly all those things which slavery in self-defence had to keep them from learning. Much that the white boy imbibes from his earliest social atmosphere forms the puzzling problems of the black boy’s mature years. America is not another word for Opportunity to all her sons.”