Some indication of the enormous economic costs of immigration are given by Breitbart news in a cost estimate of the amount of money that will be needed to support the 519,018 refugees who have been resettled by the United States government since October 2009: http://www.breitbart.com/big-government/2017/02/19/refugees-will-cost-taxpayers-an-estimated-4-billion-in-fy-2017/.
The cost is US $ 4.1 billion. The article grimly notes, “Even if the Trump administration were to entirely shut down the flow of refugees into the United States in FY 2018 and beyond, the refugees who have already arrived in the country will cost at least another $3.5 billion in 2018, and about $2 billion to $3 billion annually thereafter until FY 2022 and beyond.”