An Idea : Dual Chamber of Japan

Aka, how to lessen Japan's xenophobism and getting it involved with the world affairs as much and as early as possible, wiht respect to the factor of coolness. :D

As some of us already know, by the later part of Heian period decentralization began to take on and ultimately internal fragmentation of Japan crystallized by the end of the era. As far as I know, the main factors behind this being : the already basic nature of the old clan system, and the expansion eastward that played hand in hand with the system of shōen, which later gave the birth to the Samurai Culture as we know it, with the established freedom for the local strongmen to recruit troops. Especially the later greatly undermined centralization, and this added to the insularity of the country resulted from the vastness of the land for the polity, then still expanding toward the lands of Emishi people in the east (though the militarized culture outdated this phase)

With focus being much absorbed into the expansion eastward subjgating the Emishi, followed by fragmentation that was hand in hand with militarization increasing insularization that has already been given a high starting point by the country's geographical location. With the decay of Tang China and subsequent decrease of its importance for the Japanese, didn't help. Hence we get our OTL Japan that is very exclusive in its people's nature of mindset, amongst, with its roots actually dating back to Heian era.

The expansion eastward to subjugate the Emishi people I think was simply unavoidable, and inevitably would have drawn a lot of attention from Japanese in any case anyhow. The need for autonomy of the local strongmen, especially in the frontier, to build up their own forces was simply unavoidable. However it seems that it was the persecution of Buddhism in China that really turned Japan away from the outside world, to the point of almost no return at best. But I think, even if with Tang China surviving An Shi rebellion, Japanese Emperor would gradually lose their power anyway, as this was due internal factors, and militarized decentralization will be inevitable, but I wonder if this can be controlled/limited somewhat if Japan had continued its relationship with China. Instead of a Shogunate system and feudalism over the whole of Japan, I wonder if the spread of daimyo system will only spread to, or at least become the most thriving in part of the country east of Kyoto only, while the remaining western part becomes at least generally more cohesive politically or less fragmented due to the influence of revenue gathered from the trade with outside world, and generally distinctively more outward looking compared to the eastern part of the country. Maybe, further this condition will become then legalized and organized into official structure, with maybe each part being set up as with its own respective political-administrative structure, each being presided over by respective Grand Governor/Minister. Essentially, Japan then becomes somekind of a "dual monarchy", with each "Kingdom" has its own role, one to relates with foreign countries while the other is meant for consolidation of the more recently acquired territory and expand further, of course both would owe submission to single emperor, that only in principle.

So, how about my idea ? Plausible ?
 
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