"Border security is big business, and a visit to the 2019 Border Security Expo reveals how that business is built on state violence." These profiteers and bureaucrats of the immigration-industrial complex were fresh from the 2019 Border Security Expo—essentially a trade show for state violence, where law enforcement officers and weapons manufacturers gather, per the Expo’s marketing materials, to “identify and address new and emerging border challenges and opportunities through technology, partnership, and innovation.” The previous two days of panels, speeches, and presentations had been informative, a major in the Argentine Special Forces told me at the gun range, but boring. He was glad to be outside, where handguns popped and automatic rifles spat around us. I emptied a pistol into a target while a man in a Three Percenter militia baseball hat told me that I was a “natural-born killer.” A drone buzzed overhead until, in a demonstration of a company’s new anti-drone technology, a device that looked like a rocket launcher and fired a sort of exploding net took it down. “This is music to me,” the Argentine major said.