The reasons for the suggested disappearance of the Indus Valley civilization were droughts and a decline in trade with Egypt and Mesopotamia, ancient civilizations which were not too extended far away from the Indus Valley. The droughts would have caused famine. Other reports equally suggest that immigration by new peoples, deforestation, floods or changes in the course of river could have affected the Indus Valley Civilization.
The advantages of a centralized government impliy the following.
After the industrial revolution, the growth of economics worldwide has been lead by large companies that need centralization to be effective.
But in ancient times like the dynasties in China, a central government unified people in order to have a better control of the society. A strong central authority made possible a much better internal operation of rules.
However, centralization has disadvantages like despotism, autocracy and deaf ears to peoples opinions and demands.
In decentralized systems like the Greeks of ancient times, The Assembly had monthly meetings in Athens to discuss the the problems of the city. The meetings were open to the public in a demonstration of civility and the right of hearing to anyone.
Nowadays we find decentralized governments like the U.S. or centralized ones like Cuba.
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<span>Michelangelo did this wonderful painting </span>
