What's the point of having a culture if you can't boast that other cultures are inferior, right? To offer a less sarcastic remark, let me point out that you se

What's the point of having a culture if you can't boast that other cultures are inferior, right? To offer a less sarcastic remark, let me point out that you seem to be claiming both that there would be "no common culture" and that "America ... will be the same as ... Canada", i.e. there will be a common culture, but it will be shared by everyone. You could certainly make a strong argument that this monoculture would prevent cultural innovation, but I don't actually think there would be a monoculture, just as there are multiple evolving cultures present within countries today, and in fact a given person can feel an affinity to multiple cultures simultaneously.