To some extent, I do want a billion Americans, but only by being accommodating for climate regugees through massive infrastructure planning and spending in the relatively climatically stable Great Lakes region. There wouldn't be much of an "American" national identity as it is currently defined due to the dramatic population changes should such a fever dream be executed.

It won't happen because libs are increasingly ecofascistic and don't care about long-term climate preparedness or saving people from the third world, but I can dream.