Just because something has happened before, doesn't mean it's bound to happen again. All those countries have also had slavery and monarchies, but we don't worr

Just because something has happened before, doesn't mean it's bound to happen again. All those countries have also had slavery and monarchies, but we don't worry about that happening again b/c humanity moves forward and certain things simply become impossible - this includes things like the return of nazism, communism, evil tyrants, emperors, juntas and whatever other anachronism you can think of "nearly all the autocracies in the world with a higher [than $6000 ] per capita income are petro-states" http://thediplomat.com/2012/10/is-chinas-communist-party-doomed/ http://thediplomat.com/2012/10/is-chinas-communist-party-doo...