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By the early twentieth century, European great powers pursued military expansion and arms races while organizing into competing alliance blocs (Triple Alliance and Triple Entente) designed to balance power and deter aggression. This militarism elevated military thinking in political decisions and created entangling commitments that meant local conflicts could trigger wider wars. When crisis came in 1914, the alliance system transformed a regional conflict into a continental and eventually global war.
The unification of Germany in 1871 was perhaps the single most destabilizing event in 19th-century European politics. It produced the largest and most industrially powerful continental state overnight, fundamentally disrupting the balance of power that had maintained relative stability since 1815. Bismarck's diplomatic genius kept Germany's neighbors fragmented and non-threatening for two decades through a complex web of alliances. But when Wilhelm II dismissed Bismarck in 1890 and began a more aggressive *Weltpolitik* ("world policy") — including a massive naval buildup to challenge British supremacy at sea — the fragile equilibrium collapsed into rival alliance blocs and competitive arms races.
By 1907, Europe had organized into two opposing camps. The Triple Alliance (1882) linked Germany, Austria-Hungary, and Italy. The Triple Entente linked France, Russia, and Britain through overlapping bilateral agreements. These alliances had a paradoxical design logic: they were intended to deter aggression by making any attack on one member an attack on all. But deterrence alliances create entanglement risk — a local conflict between two states could automatically activate commitments across the continent. The alliances were simultaneously a safety mechanism and a tripwire, and which function dominated depended entirely on whether political leaders could control the escalation.
Parallel to alliance formation, a cult of the offensive pervaded European military planning. Military theorists argued that offense was inherently superior to defense and that rapid, decisive offensive action would win wars before they became costly. The German Schlieffen Plan (revised as the Moltke Plan) called for rapid defeat of France in the west before turning to Russia in the east, requiring immediate invasion of neutral Belgium at the first sign of war. This planning rigidity meant that mobilization was effectively irreversible — once military timetables started, diplomatic options narrowed rapidly. By 1914, military planning constrained political decision-making rather than serving it.
The sequence from the assassination of Archduke Franz Ferdinand (June 1914) to general European war (August 1914) took six weeks and illustrates the system's logic in action. Austria-Hungary mobilized against Serbia; Russia mobilized to defend Serbia; Germany declared war on Russia and invaded France via Belgium; Britain entered the war to defend Belgian neutrality. Each step seemed defensible to the actors in the moment, yet the system design made catastrophe the predictable output of its own machinery. Understanding this does not excuse any single actor's decisions — but it does explain how a regional political crisis became the defining catastrophe of the 20th century.
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