Since the fall of the Berlin wall in 1989, construction of border walls has quadrupled to reach 70 around the world, on the pretext to put a halt on illegal immigration, prevent terrorism or avoid the expansion of regional conflicts

Benjamin Netanyahu sent a tweet in support of President Donald Trump's plan for a wall along the Mexican border, he can barely have expected it would be retweeted 40,000 times and cause a backlash at home and abroad