Yes. Germany was the most powerful enemy against which the US fought in World War 2. (The first battle the US fought in the European Theater was in North Africa and it was against France. The US lost.)
Germany
Germany and Japan mostly
Germany
The US fought Germany and Austria-Hungary in World War I.
Germany,japan and Italy
Germany, Austria-Hungary, Turkey, and Bulgaria.
Germany and japan
france belgium germany
Germany japan Italy
I dont know, why?
Depends on what side your talking about (US or Germany)
There was almost no fighting in Germany in World War 1, except in East Prussia in August-September, 1914.