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Why do some insurgent groups escalate violence to higher-intensity insurgencies or civil war? We explore this question among 140 insurgent groups worldwide across various thresholds of armed conflict. We argue that the main drivers of escalation are insurgent networks and domestic resource mobilization. Findings show that territorial control and engagement in criminal activities to finance operations are key factors associated with insurgent-inflicted battle deaths. The number of insurgent alliances, however, is the strongest determinant of higher-intensity armed conflicts. State counterinsurgency strategies also play an important role. Many of these insights support an exploratory look at rising insurgent violence in West Africa's Sahel region. [ABSTRACT FROM AUTHOR]