The real story of the US-Mexico border wall | Mapped Out

Donald Trump promised to build a wall along the US-Mexico border. But the efforts to fortify it didn't start with him. Why are US politicians so fixated on the southern border? And if Trump didn't build the barriers, who did?

00:00 Whose wall is it?
00:39 The extreme case of Eagle Pass, Texas
01:31 One of the world’s busiest borders
03:49 When Republicans talked differently about immigration
05:11 9/11 and the Secure Fence Act
06:33 The story of Friendship Park
10:53 Why many US politicians want to build border fences