Which system of international alliances dominated the world's foreign policy decisions from 1815 until 1918?

Question

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The system of international alliances that dominated the world's foreign policy decisions from 1815 until 1918 was the balance of power system. This system was based on the idea of securing a balance of power between the great powers of Europe to prevent any one power from dominating the others. This was achieved through alliances and strategic diplomacy.

Which System of International Alliances Dominated the World's Foreign Policy