It is sad, really. Trump made a big song and dance about the, what, maybe three feet of wall so far built, but all it takes is just a cheap saw to cut through it:
https://www.bendigoadvertiser.com.au/story/6471819/trumps-wall-easy-to-cut-with-cheap-saw/?cs=10193
“He's building a wall - and they're cutting holes right through it. Migrants and smugglers have succeeded in cutting through US President Donald Trump's "virtually inpenetrable" border wall using cordless saws that cost as little as $US100 ($A145) apiece at hardware stores, border agents and officials told The Washington Post. Trump administration officials admitted being aware of "a few instances" in which human smugglers managed to breach rebuilt sections of the $US10-billion wall that Trump once promised Mexico would pay for, the paper reported. The widely available saws can cut through the wall's steel bollards within a matter of minutes. The nine metre panels can then be easily pushed forward, allowing people to pass through. Most of the reported border crossings involving cuts through the wall have occurred in the busy area near San Diego [in southern California], the paper said. Past and present border officials insisted the newly reinforced sections of wall are still harder to cut through than they were before. They attributed the new breaches to the constant innovation of smuggling gangs, which amount to a multibillion-dollar industry of sneaking undocumented immigrants into the US. "They're not just going to leave San Diego because the wall gets better," Ronald Vitiello, a former US Border Patrol and US Immigration and Customs Enforcement chief, told the Post. "That's life on the border." Trump touts the wall as almost impossible to get through and has brought reporters along to show off what he calls the "Rolls Royce" of walls.”
Really, even if a force field from the comics was constructed, it would only be a symbol needed to be torn down. The best wall is to take the US armed forces from fighting foreign wars, and use them to protect American borders. It is absurd to claim to defend the world, while the entire demographics of the place changes by illegal immigration, then collapses, even if civil war does not bring down the experiment of America first. But, the US has the Western death wish, and does not want to survive. As a social organism, it is ethno-suicidal and longs for a slow, agonising death.