A big similarity was that both medieval Europe and Japan employed feudalism; roughly summarized in Europe as: King --> Clergy --> Nobles --> Knights (Vassals) --> Serfs; summarized in Japan as: Emperor --> Shoguns --> Daimyo --> Samurai (Vassals) --> Serfs. Addressing the second portion of yoru question, it's YOUR opinion, so I'll leave it up to you :)
Further Topics for Study: Feudalism, Serfs, Vassals, Medieval Europe, Medieval Japan, the Heian Period, The Sengoku Period, the Dark Ages, Christianity, Animism, and more!
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Answer:
I believe it's resented the destruction of the southern economy
The constitutional amendment is amendment 15