Among the factors leading to an end to Europe's balance-of-power system under the Concert of Europe was

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The solidification of previously flexible alliances between the European powers undermined the balance of power system, as it led to the creation of two opposing blocs with fixed alliances, which increased the likelihood of conflict and reduced the chances for diplomatic negotiation and compromise. The system was also weakened by the emergence of new economic and military powers, such as Germany and Russia, which challenged the existing power structure and upset the delicate equilibrium of the previous century. The rise of fascism in Germany and Italy was a consequence of these underlying factors, rather than a cause of the breakdown of the balance of power system.

Among the Factors Leading to an End to Europe's Balance-Of-Power