In your link where you got your information (which had syntax issues making your paragraph confusing at best), the very next paragraph:
"The CMS report, written by Robert Warren, a former director of the U.S. Immigration and Naturalization Service’s statistics division, says 65 percent of net arrivals — those joining the undocumented population — from 2008 to 2015 were visa overstays."
This is from your own link.
How could you not see this?
https://www.theatlantic.com/international/archive/2019/04/real-immigration-crisis-people-overstaying-their-visas/587485/
https://cmsny.org/publications/jmhs-visa-overstays-border-wall/
There has been a huge uptick since Trump took office in women w/children. Still, the numbers are much, much lower than they were in 2000. Less than half.