I understand visa overstays are a huge problem as well.From your post and factoring in Ann Coulter. I think a safe to say number would be between 20 and 30 million perhaps 25 million. I’m not even going to mention my old source immigration expert James T. Walsh from 2007 which is way out of date by now but he did come up with 36 million and 2 million visa over stays for 38 million. But, like you say it’s really tough to figure.
Yes visa overstays account for 40% of the illegals. Securing the border will not solve that problem.