I see this sort of argument far too often. Of course the US is a country of immigrants just as every other country except Africa is a country of immigrants. T

I see this sort of argument far too often. Of course the US is a country of immigrants just as every other country except Africa is a country of immigrants. There comes a point where it is prudent for the current residents to limit hordes of competitors pouring in to take the resources and infrastructure built within the past hundreds of years when their ancestors cozily stayed in their home countries while pioneers busted their nuts off as indentured servants or lived in isolation without "modern" infrastructure. Are you arguing that 300 years is too new? How about 400 years? Or 800 years? Where do we draw the line? How old does a country need to be to not offend the rest of the world in trying to keep their resources and infrastructure from being spread too thinly?