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

There are a few places where it makes sense to have a wall; namely, in or near populated areas where it isn’t feasible to have someone watching the border 24/7. A project to construct a comprehensive set of border walls where they were deemed useful but didn’t yet exist was started under the George W. Bush administration and finished under the Barack Obama administration. The “border wall” issue was already solved BEFORE Trump, and all Trump initiated was building walls everywhere it didn’t make sense, like in the middle of the desert, miles away from any roads.