This is a great article I read years ago that came across my TwiX feed again this week:
https://www.theatlantic.com/magazine/archive/2019/04/david-frum-how-much-immigration-is-too-much/583252/
"Demagogues don’t rise by talking about irrelevant issues. Demagogues rise by talking about issues that matter to people, and that more conventional leaders appear unwilling or unable to address: unemployment in the 1930s, crime in the 1960s, mass immigration now. Voters get to decide what the country’s problems are. Political elites have to devise solutions to those problems. If difficult issues go unaddressed by responsible leaders, they will be exploited by irresponsible ones...
...Across the developed world, very high levels of immigration have coincided with widening class divisions, the discrediting of political and economic elites, and the rise of extremist politics. And immigration pressures will only intensify in the decades ahead, for reasons obscured by media coverage of immigrants as poor and desperate. That coverage isn’t entirely wrong. Many immigrants are poor and desperate, especially refugees fleeing war or famine. But immigration is accelerating so rapidly in the 21st century less because of pervading misery than because life on our planet is improving for so many people. It costs money to move—and more and more families can afford the investment to send a relative northward. “Every boat person I’ve met has been ambitious, urban, educated,” says Doug Saunders, a Canadian journalist who has reported extensively on global population movements. “They are very poor by European standards, but often comfortable by African and Middle Eastern ones."...
...Too little immigration, and you freeze your country out of the modern world. Too much, or the wrong kind, and you overstress your social-insurance system—and possibly upend your democracy. Choose well, and you build a stronger, richer country for both newcomers and the long-settled. Choose badly, and you aggravate inequality and inflame intergroup hostility. How we choose will shape the future that will in its turn shape us."
Edited: Missing paragraph