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What if Japan remained divided at the end of the Sengoku and to this day what would be the linguistic consequences?
this is what I know..
1. Central Japanese dialects(dialects spoken from Kansai to Kanto area) won't be able to impose themselves to the other Japonic Languages meaning that the Central Japanese would not impose the F to H change to other Japonic languages, and additional changes might spread in Central Japanese dialects completely like /hj/(which shifted from pj to fj originally) completely shifting to sh which means words like hyuga would be pronounced as Shuga.