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

They can’t just hop on a flight? They need a visa that is often rejected.