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I think to me this is the scariest part. I've seen some information predicting WWIII a couple of years ago and they said it usually takes place when you have a group of super powers instead of 1 and they were talking about how the US power has been slowly falling while the strength of others such as Russia and China were increasing leading to that perfect storm of another World War and a possible new world super power.

Nature hates a vacuum.
When one power weakens, another will emerge.

@gniksivart - It's called the Thucydides Trap, where a status quo power is challenged by a revisionist power (essentially what you're saying). Roughly 70% of the time, that trap results in war.

Yes, I believe that the U.S. will go to war to protect its supremacy/hegemony in the world. A U.S. that loses its pole position is one in decline and collapse. War is the only way to extend the life of Pax Americana.