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By Daveed Gartenstein-Ross, Jacob Zenn
Editor’s Note: The war against terrorism involves fighting more than terrorists. Some groups use guerrilla war, and still others are proto-states. The post-9/11 struggle has also brought the United States into greater contact with warlords, clans, and other non-state actors. Daveed Gartenstein-Ross and Jacob Zenn of the Foundation for the Defense of Democracies and the Jamestown Foundation, respectively, try to bring a sense of order to these many actors, offering a spectrum of "violent non-state actors" as a way to better conceptualize them.
The Trump administration’s appointments have signaled that it will continue to prioritize the fight against jihadist violent non-state actors (VNSAs)—a broad term that we find far more useful than an exclusive focus on terrorist groups, but a term in desperate need of clarification. In this article we provide a taxonomy of VNSAs that can be used to produce more rigorous discussion of them.
Beyond the challenge of jihadism, various VNSAs are likely to play a greater role in world politics in the coming years. Weakening states, ecological challenges, and rapid technological innovation, among other factors, have allowed non-state actors to challenge the power of nation-states in a way that has not been possible in recent history. As Sean McFate demonstrates in The Modern Mercenary, the Peace of Westphalia in 1648 didn’t end states’ reliance on private armies, but rather marked the beginning of a transition from the dominance of private military force to the ascendance of state military primacy that “was gradual, spanning centuries.” By the 20th century, the world had reached a period of absolute nation-state dominance.







