Final answer:
When expansionist ambitions threatened the Congress of Vienna, Prince Talleyrand of France suggested an alliance between Britain, Austria, and France against Prussia and Russia.
Step-by-step explanation:
When expansionist ambitions threatened the Congress of Vienna, Prince Talleyrand of France suggested that Britain, Austria, and France form an alliance against Prussia and Russia. The Congress of Vienna was a conference held in 1814-1815 to reconstruct Europe after the Napoleonic Wars, and it aimed to establish a balance of power among European nations. However, the expansionist ambitions of Prussia and Russia posed a threat to this balance, leading Talleyrand to propose the alliance. By forming this coalition, these three European powers sought to counter the aggressive goals of Prussia and Russia.
Learn more about Congress of Vienna