No single power planned this war

Clark rejects the long-dominant idea that one nation — usually Germany in older accounts — deliberately engineered the war for expansionist gain. Instead, he argues that every major capital was responding defensively to threats it perceived as real, even when those threats were partly imagined or exaggerated by anxious officials.

Austria-Hungary feared genuine disintegration from Slavic nationalism; Russia feared losing its last credibility as protector of the Balkan Slavs; Germany feared encirclement by France and Russia; France feared abandonment by its Russian ally if it hesitated. Each fear was locally rational given each nation's information and history, but nobody was steering the whole system toward war as a goal.

This reframing doesn't excuse anyone — it makes the outcome scarier, because it means catastrophic wars can emerge without any single architect, purely from mutual misreading. Understanding causes doesn't require finding a culprit; sometimes systems produce disasters nobody wanted.