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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It’s still propaganda. Lots can get holiday visas and never go home. Not that I’m against immigrants. If move if I could. I plan to. Maybe Germany or Brazil.
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.
They can’t just hop on a flight? They need a visa that is often rejected.
It doesn’t.
Objectively many anti-immigration hard liners weren’t concerned about the physical wall for this reason until trump came along.
But trumps campaign to build the wall helped get him elected so when an anti-immigrant politician wins an election you hitch your wagon to them.
So that created a tension where trump literally wanted a new wall despite it not being an effective tool. But you go along with it because he also was in favor of a bunch of other anti-immigration measures.
Re your edit.
Don’t feel bad. How would you know all the international travel laws?
Since there has historically been a lot of conflict between nations the default is for borders to be closed.
Countries can negotiate travel agreements. When countries are particularly friendly with each other, movement restrictions get loosened.
At one extreme countries may ban travel to or from certain other countries.
When they get a little friendlier they start to allow temporary permits (either for business or tourism).
Even friendlier countries might make it easier to obtain citizenship or waive visa requirements all together.
The EU goes a step farther. EU citizens can travel freely between EU nations and stay to work as long as they like.
The US goes even farther than that. The separate “states” are so united that we did away with the concept of citizenship between states. You just have residency and you can change it any time you like by just spending more time in one state than an other.
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