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Greater Iran cannot be accurately compared to Europe. Greater Iran has two very convenient river systems linking the core of the region together – Europe doesn’t. There are peninsulas and mountain ranges that make it very difficult to pass over (see the border between Spain and France, Italy and the Holy Roman Empire). That’s at least partly why Europe is far more diverse than Greater Iran – take a look at a map of [European states in 1300 and look how fragmented they were/are.](http://i.imgur.com/ioQ9e8e.jpg)
And, even then, Greater Iran did have constant internal warfare: coups and wars were not just European inventions. If you take a look at the history of the empires that ruled over the land of Greater Iran, you can see that many – like the Achaemenid Empire, like the Median Empire, like Parthia – ruled for less than a century before being replaced by another ruling faction or breaking apart. Most European states had far more internal stability (see the Kingdom of England, Castile and Sicily).