What protects the peace settlement reached at the Congress of Vienna Britain Austria Prussia and Russia formed the what?

The peace settlement reached at the Congress of Vienna was protected by the formation of the Concert of Europe, a system of alliances among Britain, Austria, Prussia, and Russia. This alliance aimed to maintain the balance of power in Europe and prevent the rise of any single dominant state, thereby ensuring stability and peace. The Concert of Europe facilitated diplomatic cooperation and collective action against threats to the established order.