The American s held up the occupation of Berlin, thereby allow the communists to split the country in half.
The same Americans who conducted daylight bombing raids over Berlin to effectively cripple the Nazis' war production? I think the split was innevitible. After all, to the victor goes the spoils. Obviously Russia wanted a piece of the victory pie, and half of Germany was what they got.
We did have some shrewd generals who wanted to ally with the Germans as soon as they surrendered and carry on the war to push into Russia and put an end to the Communist state. By that time everyone was just ready for the war to be over though.