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What you apparently do not understand is that there is nothing special about foreign contracting.
We have treaties that handle such things simply.
Nobody, and most especially not Trump, is going to get Mexico to build any wall.
Trump is not a professional builder; he doesn’t even have a license. He is a broker (I know you don’t understand that word, but you can look it up).
There are so many things that you demonstrate here that you don’t know that it is difficult to communicate with you without writing a thesis.
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Wake up and smell the coffee. Americans are getting screwed by almost all foreign countries. Why do you think we have enormous trade deficits with countries? Professional politicians either are dunces in making deals or they are following orders of their rich donors, who want manufacturing sent abroad to expand their profits.
Trump knows more about building than all the congress critters in DC combined.
No Trump, no wall, no vote from me.