You're not too smart MathMan. Of course the percentage of incarcerated US citizens is higher. That's because there are more, by far and away, US citizens in America compared to illegals. Knuckledraggers like you are the reason minorities feel embolden to shit all over our great country.
I also want to apologize. I misstated a fact. I previously said 25% of prisoners within the Federal prison system are illegals. That number is ONLY 20% per BOP. No matter how you slice it, 1 out of every 5 prisoners at the Federal level are being fed, clothed, and bathed with your tax dollars. That is simply unacceptable.
https://www.bop.gov/about/statistics/statistics_inmate_citizenship.jsp