Book Project The Power of Ethnic Groups – answers why some Soviet successor states experienced secessionist civil war after the collapse of the Soviet Union. I use structured comparison to detail social-political histories of Russia, Moldova, and Ukraine and fuzzy sets to assess twenty-four explanations of secessionist violence across the full range of former Soviet cases. I demonstrate that in the chaos of state collapse the coherence level of ethnic groups structure the opportunities for political action and likelihood of secessionist civil war. The fuzzy set truth table for the book may be found here.