How did the geography of greece present obstacles to unity?

Ocean drift urged Greeks to end up distinctly gifted mariners and brokers 
topography isolated the Greeks physically. They were 
1. cut off from each other, 
2. built up their own particular frameworks of government, and 
3. battled much of the time 
defeating this detachment to bring together the locale would be exceptionally troublesome

The answer would be newton’s second law

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