Did Germany occupy itself?
No. In the sense that you occupy your own house.
Because of the riots, recent overthrough of the Third Riech and lack of food. Also the US was helping to restabalize the economy, like training wheels for Germany. And one more thing, the US did not completely occupy Germany, such as the Russians occupied Berlin until 1961, and the french also majorly occupied a section of Germany including one 1/5 of Berlin.