Every time a great power rises up and overtakes the hegemonic power there has been war, there has not yet been a peaceful transition of power where the top dog loses it and the up and coming gains it. If we can see a peaceful transition from the US to China, it won't be long before India catch up and play out a kinda of 'Cold War' with China, with the US acting as a fallen empire much like the British Empire after WW2 but with far greater consequences initially. If the US can't stop a total collapse it will make the fall of the USSR look like a walk in the park. the USSR fell from a position of strength in their people, society and culture. The US is ruined domestically with poverty, drugs and debt running rampant already.