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

Question

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The balance of power system dominated the world's foreign policy decisions from 1815 until 1918. The system aimed to prevent any one state or group of states from becoming too powerful and hence posing a threat to the others, and relied heavily on the formation of alliances to maintain a balance of power. This was characterized by various multilateral alliances and treaties, including the Congress of Vienna (1815), the Concert of Europe (1815-1867), and the Triple Alliance/Triple Entente system leading up to World War I.

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