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Of course, we will not find a universal criterion. But it develops, as it were, the "spirit of history."
What decades over the past 100 years have been the best for the people of Russia, and for the state of Russia?
For the state, probably, 30-70s ..
For the people-1962-75 ... perhaps 2001-2008 ...
But this is IMHO, as is now customary to write on the internet ...