Just how primitive is Texas that you can believe we can't construct things on, above, under, or in a river?
You've seen those big things in the sky flying around ~ glinting in the Sun? We call them airplanes. They carry people.
right, we have airplanes because the market can support their existance. I don’t think a border fence would be cost effective to build one. I have actually designed and built fence systems in real life.