Answer:
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if only person was in charge of a government, it would gradually convert into a dictatorship, simply because there are no other branches of the government to keep the executive government in check. This is why governments have three branches, to make sure power is balanced. Two branches and even four branches wouldn't work because of uneven balances in power.
Spread of religion and political views
Made money and helped the economy create things with paper such as books and other paper products
The flow of oil from the region's oil fields.
