I admit freely enough that, by careful breeding, supervision of environment and education, extending over many generations, it might be possible to make an appreciable improvement in the stock of the American negro, for example, but I must maintain that this enterprise would be a ridiculous waste of energy, for there is a high-caste white stock ready at hand, and it is inconceivable that the negro stock, however carefully it might be nurtured, could ever even remotely approach it. The educated negro of today is a failure, not because he meets insuperable difficulties in life, but because he is a negro. He is, in brief, a low-caste man, to the manner born, and he will remain inert and inefficient until fifty generations of him have lived in civilization. And even then, the superior white race will be fifty generations ahead of him.
H. L. Mencken