Why did Austria, Britain, and France oppose Prussia's plan to take all of Saxony?

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At the Congress of Vienna, Austria, Britain, and France opposed Prussia’s plan to annex the entire Kingdom of Saxony primarily to maintain a stable balance of power in Europe.12

The opposition was driven by the following strategic concerns:

  • Preventing Hegemony: Austria, led by Klemens von Metternich, sought to prevent the excessive territorial aggrandizement of Prussia and Russia. By resisting these expansionist designs, Austria, Britain, and France formed a common front to hold the two powers in check.12
  • Maintaining France as a Counterweight: Metternich and the British foreign secretary, Viscount Castlereagh, viewed a stable France as a necessary counterweight against potential Russian and Prussian dominance.1
  • Strategic Buffer Zones: Britain, in particular, wanted to ensure that Prussia would act as a buttress against future French aggression rather than becoming an unchecked regional hegemon. Consequently, Prussia was ultimately granted only two-fifths of Saxony and was compensated with territories in Westphalia and along the Rhine River to guard the western frontier.2