In the same way that saying “they are eating the cats” is a bullshit that wants to demonize all immigrants, thinking that if you put in millions of immigrants in a short period of time without background checks they will all be wonderful people who will not cause any problems is another bullshit. And I believe that in the case of the Democrats they do it from a business perspective as I explained above, it is a way to buy voters.
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IIRC ~100 million Americans are first or second generation immigrants, and they tend to be (particularly 2nd gen) around average or better than average on metrics like income, education, crime, etc and tend to vote similar to other people in their age range, so it seems that the evil Democrat plan to buy votes is a big failure.
This country was built on immigration and hopefully with continue to be, otherwise we're all fucked and not in a pleasant consensual way.
I was aware immigration was an important part of the building of the United States as a nation, but regularly I had this impression they did not actually outperform the average when came to those metrics you are talking about, but it makes sense when one keeps in mind the huge brain drain there are in many developing countries.
For example, I am from Venezuela and I live in Venezuela, with the lastest humanitarian parole and other means people have managed to move to the United States I am impressed with the amount of enginners from my college who have decided to give the big step and move to that country, it is not only desperate people seeking to flee from poverty, but actual professionals who just want to have their family a better future while at the same time working their ass off in humane conditions.
In contrast, though I must mention it is unfortunate Tren de Aragua has managed to get some of their people there in the States. Criminals from this country are really something else. There is no country in which there are no criminals, though. Perhaps, the Vatican city?