There is another difference.It really is like the Berlin Wall - except with West Germans building the wall.
East Germany (goaded by their Soviet masters) built their Wall to keep their own people IN.
Trump's Wall would be built to keep OTHER people OUT.
The difference is a HUGE one.
Our OWN people can come and go as they please.
You might get shot for trying to sneak IN, but you won't get shot for trying to sneak OUT , as happened to so many East Berliners and East Germans.
( and this from somebody who thinks the wall is a stupid and ineffective bumper-sticker-slogan idea )
Yep, there is a yuge difference. That's what makes it so screwy. We rightly condemned the East German government for building the Berlin Wall. Would we have cheered if the West Germans had built it instead, to keep the East Germans out?