How long can Japan remain Isolated ?

Isolated is a very broad term, they might not get into the colonial squable till the late 1800's or not at all if the learn what europe is doing, if they modernized itself, is the same as otl, maybe more internal friction if shogun still exist or they reform, depend, japan otl luck and happenstance(plus their fall into insanity) was incredile, so anything can goes.
 
Japan is not like some low population African colony with unrelated tribal peoples that have no guns, economy, or unifying factors. With the right PoD I don't see why Japan can't remain isolated to the present, even if it is foolish.

Japan in that time was already high organized State and of it's people are well educated (most of them).
And had Army and population that was willing to fight to there death, so Invaders could face tremendous losses by all kind of attacks, ambush and traps.
 
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