Maybe Trump read the predictions in numerous forecasts published in 2024:
Posted By: BigPapasan
... Maybe someone finally told him that if 11,12, or 20 million illegals were deported, our economy would crash - no agriculture, no construction, no service industry. ...
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http://carsey.unh.edu/sites/default/files/media/2024-08/economic-impact-mass-deportation-lit-review.pdf The Economic Impact on Citizens and Authorized Immigrants of Mass Deportation [Aug 29, 2024]
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"Conclusion: The deportation of substantial numbers of unauthorized people, most of whom work, would, self-evidently, have substantial negative consequences for those deported and their families. Research shows that mass deportation would also negatively impact the American economy and people in a number of ways. ..."
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http://www.piie.com/blogs/realtime-economics/2024/mass-deportations-would-harm-us-economy Mass deportations would harm the US economy. [Sep 26. 2024]
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3.
http://www.americanimmigrationcouncil.org/research/mass-deportation Mass Deportation: Devastating Costs to America, Its Budget and Economy [Oct 2, 2024]
[very long report]
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4.
http://www.cnn.com/2024/11/11/business/deportation-immigration-trump-cost-americans 4 ways Trump’s mass deportation plans could hurt your finances. [Nov 11, 2024]
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5.
http://www.scrippsnews.com/politics/truth-be-told/experts-predict-mass-deportation-would-damage-us-economy Experts predict mass deportation would damage US economy. Scripps News' "Truth Be Told" series examines claims that President-elect Trump's plan to expel undocumented immigrants would come at a high cost. [Dec 12, 2024]
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"... Truth be told, many economists say removing millions of immigrants from the workforce would cause a costly shock to already tight labor markets and stressed supply chains. The industries likely to take the hardest hits are farming, construction, hospitality and food services. ...]
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6.
http://blog.ucs.org/karen-perry-stillerman/cruel-trump-deportation-plan-will-hurt-farmers-food-workers-and-all-of-us/ Cruel Trump Deportation Plan Will Hurt Farmers, Food Workers, and All of Us. [Jan 16, 2025]
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And many more studies.