Global rates of terrorism have skyrocketed since 9/11, yet the aggregate increase tells us very little about the distribution of attacks across different regime types. Contrary to the traditional scholarly view and popular perceptions in the West, reasonably high-quality democracies enjoy a robust and growing "triple democracy advantage" in facing the scourge of post-9/11 terrorism. Not only are liberal democracies and polyarchies less prone to terrorist attacks than all other regime types, but the rate of increase in the number of attacks among these democracies is substantially lower in comparison to other regime types, and they are significantly better at minimizing casualties.