Where Does Illegal Immigration Mostly Occur? Here's What The Data Tell Us
Most undocumented immigrants didn't enter this country through Tijuana, where news cameras have captured images of thousands of immigrants seeking refuge during recent months.
And they didn't enter near the border town of McAllen, Texas, which the president visited Thursday during the 20th day of a partial government shutdown fought over constructing additional barriers on the Southern border.
When it comes to people in the country without proper documentation, the majority of them didn't cross the Mexican border at all. Most of them came to the United States legally — but then don't leave.
About 700,000 travelers to the United States overstayed their. DHS estimated that,as of Sept. 30, 2017, the end of that fiscal year, more than 600,000 of those travelers were still in the U.S.
