In this journal, I did exactly that regarding the decline of the "future U.S.A." in 2276 A.D. (270+ years from now), its "de-centralized & regional" existance for the next 500 years (in the 23-28th centuries), then its centralized revival in the 29th compliments of the "Normans of the future."

I did that wacky prediction based on what happened with England - from the time of the Roman occupation [1st-5th centuries], to the time of 500 years of de-centralized regionalism, then to central rule once again compliments of the Normans in 1066.