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 anywhere to be found, and if they were, it is not likely that they would ever trouble us with their presence. The fact that the Chinese and other nations desire to come and do come is a proof of their capacity for improvement and of their fitness to come.

Our Composite Nationality (1869)