Things are grim in terms of economy and human rights in USA, I'd agree thus far, but I wouldn't worry about WWIII. USA even had to stop dead in its plans to attack Iran due to waning economy and internal political issues.
The word is out: getting rid of the US dollar as the backup currency has become a priority for every bigger nation/union in the world.
The process has started, with the Middle East working on moving towards the Euro, and China/Russia recently opening a new exchange market in their own currencies (to replace the USD they use now) and the rest are to follow soon.
Without this backup, the dollar will quickly devalue, USA will not have the ability anymore to loan resources for its empire ambitions, even if Hitler himself was revived and elected for the next president.