If it wasn’t for still needing to get permission from the government to apply it and build it crowd funding would work.
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Hmm. That’s true. Never forget we’re dealing with the Government.
We could crowdfund the wall in a DAY - but the Government would just say “thank you for the money!,” set up a committee to study how to “best use it,” then decide it’s more “responsible” to use it to kill more unborn babies, line the pockets of politicians (and their friends), provide more needles to drug addicts and set up re-education camps for people who offend other people with their ideas.
They could tie it up for 20 years just doing “environmental impact studies” alone.
That part is done. Congress passed a vote to build the border fence in 2006. Of course, Democrats say that it was for a “fence”, not a wall. Estimates for the cost was up to 50 billion over 25 years.
https://en.m.wikipedia.org/wiki/Secure_Fence_Act_of_2006