> The U.S. is more diverse than it's ever been [1], and under Trump we're still below the deportations of Obama's terms.
Ethnic diversity is neither really here nor there in terms of the measurable needs that immigration fulfills. Immigration keeps economic and population growth rates trending up. Having high skilled immigration to bolster science and research is nice, but it's still mainly about the growth.
Yea, Obama deported lots of people, but even then we still had net positive migration. Now under Trump, we have net negative migration for the first time in decades. The very public terror campaign waged by the Trump admin was in part to deter immigration in the first place.
> Sounds like open-borders immigration was never necessary in the first place, given that we're being beat by a country with a similar demographic skew that we had like 80 years ago.
1) Economic growth is possible with stagnating/declining population levels if you overcome those deficits with commensurate increases in productivity per capita. Otherwise, you're cooked.
2) The US is actually far more productive per capita than China - in fact, the US is one of the best in the world, as far as that goes.
With those points in mind, we can begin to see why China has an easier time growing economically with little immigration. The US has a much harder time doing the same. We need more population, since it's just harder to squeeze more productivity out of our already very productive workforce.
Once China achieves similar productivity levels, they will need to rely more on growing the population.
We were actually on track to catch up to China's population levels in a few of decades (thanks to immigration). So unless China successfully pivoted to mass immigration or expansionism, the US was likely to remain dominant - easily so - for the foreseeable future.
That's why the MAGA anti-immigration push is so tragically stupid and suicidal (if it persists). They're killing America's golden goose.
As an aside: I wish the "open borders" canard would die. We've never had open-borders immigration in recent history. Definitely not since 9/11. Not even under Biden. Border laws were enforced. Biden has the same apprehension rate at the border as both Trump and Obama.