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An event leading to German surrender was:
the victory of Turkey and Bulgaria
the uniting of Austria-Hungary
the United States joining the Allies
the Allies retreating from the Germans
the surrender of Russia

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kjlovers16
An event leading to the German surrender was the fact that the United States joined the side of the Allies - with this happening, there was no way how Germany would be able to win the war anymore. 
The united states joining the allies, you should also know that Germany surrenderd more than once.