U.S. Occupation of Japan produces a Federal Republic

What if the U.S. occupation of Japan from 1945 to 1952 had produced a federal republic with an executive Presidency just like that of the United States. In this scenario, each state,with the exception of Hokkaido, would cover a territory equivalent to the size of a group of prefectures and would have in addition to its own legislature, its own directly elected executive governor. Larger cities like Tokyo would also be their own states.
 
So maybe the coup was a sucess or radical killed the emperor and his family to avoid being target step down and just become regular citizen(or abandon the country to avoid being targeted), the emperor was cheaper and prestigious to keep but again anything can change....

that will make politics interesting, would kill the centralize power over tokyo and maybe allow more dynamical economics during 70-80's, if there is a bubble will be in lesser degree.
 
How about the U.S. doesn't spend the time and effort making Japan a constitution, and instead just gives them the U.S. one?
 
But aside from a few local festivals, and some dialect differences that get papered over in front of foreigners, politically and culturally, there would be no reason for any sort of Japanese Federalism. Yes, we have Northern Hokkaido, the Ryukyus, and the East and West Tokyo Archipelagos, that were only annexed during the Tokugawa Shogunate, and formally incorporated into Japan during the Meiji Restoration. Think the difference between Franklin and Shelby Counties (in a given state), not the difference between Kentucky and Iowa, or even Kentucky and Tennessee.
 
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