Most Dreaded Terror 14 Japan
Edgar Allan Poe's 'The Raven' illustrated by Gustave Doré
Dore “Raven”
https://hyperallergic.com/102457/rediscovering-the-dark-splendor-of-gustave-dore-with-edgar-allan-poe/   downloaded Feb 18, 2018
It is the 22 of March, 2018.   Here is the survival experience of Japanese dynasties. 
http://www.nobabies.net/clip_image018_0000.gif
Information taken from John B. Teeple TIMELINES OF WORD HISTORY, DK Publishing, New York, NY, 2006, page 554, 555 Japanese dynasties.  The vertical axis is the chance that a dynasty of that age will survive another 50 years.  The horizontal axis is the age of the dynasties. 
By now you are thoroughly familiar with the axes.  The probability that a dynasty (yes, we are talking dynasties now, not civilizations as in other parts of the world) will survive another fifty years is on the vertical axis graphed against age on the horizontal.  The result is most impressive, although no match for China in stability. 
For one thing, notice that over the first fifty years the chance of survival rises.  Remember there was a lot of that in Egypt.  Japan is an archipelago.  Although it is long and thin (and looks sort of like a dragon if you turn the map south side up) there is not the isolation of the desert.  A kind Swedish woman once remarked to me, “In the old days water did not separate people; it brought people together.”  If anything, it would be the precipitous mountains of the interior that would limit travel.  Instead (drawing on my almost total lack of knowledge of history) I suspect it was the noble families, the bureaucrats and court officials.  Potentially they had the clout to challenge a new dynasty. 

Now notice the notch.  It occurs at the same time as the notch occurs in China.

 

China:
graph
Japan:
http://www.nobabies.net/clip_image018_0000.gif

I’ll not say “exactly” the same time, since we have lumped things into 50 year increments.  But it as close as we can tell.  And the notch is deeper than it was in China.  I suspect that when lowered fertility leaves the imperial dynasty vulnerable the same powerful families still kettle like so many waiting hawks and vultures, looking for a time to stoop. 
In such an environment it is not surprising that no Japanese dynasty makes it past the 300 year brick wall. 
Next we shall look at people of more modest means than Asian emperors.  

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