“If only ten or twenty Negroes had been put into slavery, we would call it injustice, but there were hundreds of thousands of them throughout the country. If this state of affairs had lasted for two or three years, we could say that it was unjust; but it lasted for more than two hundred years. Injustice which lasts for three long centuries and which exists among millions of people over thousands of square miles of territory, is injustice no longer; it is an accomplished fact of life.”