china's early leaders limited contact with outsiders
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Mountain ranges & deserts
The history of civilization does not include everybody. No hunting or nomadic peoples could generate a civilization -- they lacked the stability and resources, and, with the exception of a limited numbers of signs and symbols, they never developed writing, unless it came from the outside.
The lesson is that the decline of a civilization is not simply the result of attack by outside invaders.
Canton
They had more resources and had more connections to the outside world. Ishmail Mansaray did this. From CIMS High School.