... idea that the centralization of the civilizations in question plays a role in their overall longevity is not entirely ludicrous. For example Egypt, which was primarily centralized around the Nile River valley, lasted for nearly three thousand years. Where as the Harappan civilization, which featured two-great cities Harappa and Mohenjo-Daro both hundreds of miles apart from one another, was faced with its' decline in a mere 1000 years since its' start and was subsequently taken over by a nomadic tribe called the Aryans, and thus all the great inventions and potential influences of that civilization lost. Of course, there are other things that affect the longevity of such a civilization. The geographic area and structural organization in which these civilizations are centered plays a large role in their success. For instance the Harappan civilization was in an area where the occurrences of nomadic conflict was slim, the Harappan civilization never ...

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