Arms trafficking has a long and influential history. At an Academy event held in Berkeley, California, historian Brian DeLay described how U.S. arms trafficking intervened at critical moments to destabilize Mexican governance. The program included commentary from historians Priya Satia and Daniel Sargent, as well as from political scientist Ron Hassner. The presentations explored how the history of arms trading may help to better understand the history of state-making and the power relations between the United States and the rest of the world.