3. Authorities & decisions: World War I: Empires & Rupture

Decision-makers, laws and consequences

Austria-Hungary declared war on Serbia in July 1914 after the assassination of Archduke Franz Ferdinand. German, Russian, French and British leaders made successive mobilization and war decisions within alliance systems.

The 1919 Versailles Treaty and other settlements redrew borders and imposed reparations. The war accelerated imperial collapse and political upheaval, while responsibility for escalation remains a subject of historical analysis.

Institutional consequences

The authorities identified above acted within institutions that determined who could govern, enforce decisions and challenge official power. The resulting changes to political participation, legal status, military control or property administration are part of the historical record of this specific event, rather than evidence that every later government followed the same path.