China started a considerably higher total, had the government actively encouraging people to have more kids (and in a position for "encouraging" to mean something) half a century ago, and has considerably lower living standards.
Not remotely equivalent.
See above.
China stopped pressuring families to have more kids about forty years ago.
Anyways, you're assuming that this alternate US has today's standard of living. With a far enough point of divergence, the US could be the authoritarian dictatorship with a 500-million+ population.
And this relates to what I was saying ... how?No, it's intended as a general note on the idea of adding Canada and/or Mexico to the US as part of pumping up the population. And people always treat it as if the only thing that stopped the US from doing that was something that could be fixed easier than snapping your fingers.