The wall won't do anything to stop immigration or it will at best do very little. The numbers seem to vary depending on what source you use, but I believe somewhere from 1/3 to 1/2 of all illegal immigrants simply overstay their visas. Other immigrants come by boat and plane. What exactly is a wall suppose to do? The wall is symbolism for xenophobic Trump fans. Nothing more.
If you're frightened of dying, and you're holding on, you'll see devils tearing your life away. But if you've made your peace, then the devils are really angels, freeing you from the Earth.