Frederick Douglas NYHS c1866.jpg  
Not the least among the arguments whose consideration should dispose us to welcome among us the peoples of all countries, nationalities and colors, is the fact that all races and varieties of men are improvable. This is the grand distinguishing attribute of humanity, and separates man from all other animals. If it could be shown that any particular race of men are literally incapable of improvement, we might hesitate to welcome them here. But no such men are any where to be found, and if they were, it is not likely that they would ever trouble us with their presence.
~ Frederick Douglass ~