The wall was already there. Extending sections from where they were put by Obama isn't space-time bending. Trumpty Dumpty even took pics in front of it, Obama era. The dimwit didn't even notice the rust and weeds already growing at the base.
You're talking about the Mexico-US Barrier fence that was not connected. Trump's wall closed a lot of gaps. Not-Black-Biden's regime has attempted to stop all border projects yet has continued to fill gaps in the wall.