The cost to our nation from militarized borders goes beyond the cost of enforcement. Both legal and undocumented migrants pay into our tax system. They boost the economy by spending money on the basics like food and rent. Many of our skilled workers in tech and medicine are immigrants. They also are the backbone of construction, agriculture and food services.  When we discourage people from entering or deport people already here we’re not safer, we’re poorer. John Washington takes a look at possible solutions in his book The Case for Open Borders.