mar 3, 1878 - Treaty of San Stefano Russian and Ottoman empires

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Treaty of San Stefano gave Russia considerable influence in the Balkans, a development that outraged Austria-Hungary, Russia's chief rival in the Balkan region (despite being an ally of the Russians and the Germans in the League of the Three Emperors). Hence, in 1878, Bismarck called an international conference (the Congress of Berlin) to sort out the problem.

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