text: how common are literal, physical fences between neighboring nations? i don't know how rare this. the us senate just passed a provision in the immigration bill that allows for the construction of more fence (some already exists in california). it seems extreme to me, but maybe it's more common than i think. i'm interested in hearing whatever people may know about this as a policy. i don't know about "neighboring nations"..what i do know is that we built a wall in ca and it was deadly.  i believe it was called "operation gatekeeper.....sorry...i don't have the right name" and it led to the deadliest year ever for immigrants.  while alot of people will say....."fuck yah.....build them there walls"  when you build walls....people will tunnel, they will construct amazing ladders.  my answer.....there are far too many literal fences (you said that) and we will never get it right.