USA Today | 24.05.2018
Kim Hjelmgaard
BUDAPEST, Hungary — At the end of World War II, there were seven border walls or fences in the world. By the time the Berlin Wall fell in 1989, there were 15, according to Elisabeth Vallet, a geography professor at the University of Quebec-Montreal.
Today, as President Trump pushes his campaign promise to build a wall on the border with Mexico, there are at least 77 walls or fences around the world — many erected after the Sept. 11, 2001, terrorist attacks in New York City and at the Pentagon. […]