How does the border wall solve the alleged illegal immigration problem when they could just hop on a flight and ‘miss’ their return flight home?

Question

EDIT: Learned that many countries are required to have a Visa before entering. They cannot travel to the US, even for tourism, without it. As a privileged American citizen, I naively thought anyone can travel anywhere for tourism purposes with just a passport.

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Answer 1

Actually, the majority of our “illegal immigrants” in the U.S. are visa overstay. Some years it is almost 2:1.

The Center for Migration Studies did a study from 2010 to 2017 and visa overstays were by far the most common method.