In practice, H1B is a pipeline to citizenship, not just for the worker but their immediate family and extended family (due to family sponsorship). One H1 visa to my dad resulted in seven additional Bangladeshis in the U.S. And my dad did not sponsor a fraction of the family members he could have.
Moreover, foreign mindsets are durable over generations: https://www.sup.org/books/economics-and-finance/culture-tran... ("In The Culture Transplant, Garett Jones documents the cultural foundations of cross-country income differences, showing that immigrants import cultural attitudes from their homelands—toward saving, toward trust, and toward the role of government—that persist for decades, and likely for centuries, in their new national homes. Full assimilation in a generation or two, Jones reports, is a myth.").
> "Moreover, foreign mindsets are durable over generation"
Right, and most countries are very conservative compared to the US, in particular many of the countries that the average H1B holder is from. India, for example. That means Republican voters. The entire premise is flawed fearmongering.
Anglo culture is distinctive both in its liberalism and its conservatism. My Bangladeshi family are well to the right of American republicans when it comes to say tattoos or divorce, but they don’t care about limited government or legal proceduralism.
I don’t have to fear monger. The cake is already baked. David Shor estimates that Trump tied or narrowly won foreign-born voters. Mass immigration didn’t kill the GOP, but it changed what kind of conservative party could assemble a winning coalition. And it looks like more like Trump (or Bolsonaro or Modi) and less like Mitt Romney or George H.W. Bush.
Hope Obama was worth it!