2021 estimate = only 400K? https://brilliantmaps.com/number-of-unauthorized-illegal-immigrants-by-us-state/
2014 report "Latin American immigrants make up approximately 84% of Illinois’ undocumented population. Mexicans alone account for 77%. Asians make up approximately 9% of the undocumented population in Illinois, but make up 12% of the undocumented population in the collar counties and 21% of the undocumented downstate. The most significant Asian countries of origin are the Philippines, India, Korea, and China. Another 5% are from Europe, mostly from Poland, the former Soviet Union, and elsewhere in Eastern Europe."
I think we all know those numbers are artificially low on purpose.