The Great Trump wall is sort of like the great wall that China built in the year 375 AD. that is almost 2000 years ago that they did that to keep out the barbarians!
This is 2019 and most people who aren't supposed to be here get here (to the U.S) on jets now through airports. They don't even bother to climb a wall, (or dig under it) they just get here on a jet with papers that get them on the plane by bribing whoever it is in that country that they need to to get here. Or they take a boat, or a submarine or they swim the ocean or they fly under the radar in a small plane. People are ingenious not stupid. A wall isn't going to stop 90% to 99% of the people that want to get here bad enough. A Wall is RIDICULOUS!
So, what's with the wall?
It's sort of like raising your hand as an artificial barrier when you don't want someone to pass. That only works if that person is listening to what you say or wants to do what you want them to.
It's sort of like Castles which became obsolete when Cannons were invented. By the way Knights in armor became obsolete when cannons and bullets were invented too!
when were cannons invented?: early 13th century which means the early 1200s.