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To make his people happy
He added today's Pakistan and Thrace, and finalised the system of government by provincial governors.
He established fleets of trading ships to supplement the slow and limited cargo transport on the road system.
He secured the borders, provided provincial government, internal and external security, and promoted trade and prosperity.
He appointed local tyrants to govern the Greek city-states, imposed a tax regime to finance the armies he maintained to enforce internal and external security, and appointed a Persian provincial governor to oversee this.
well, it depends if they make environmentally safe technology
science and technology
Science can lead to advances in technology by the electricity. The electricity is used to make computers and eventually will be used to make most of our items in the future and next few generations.
they made the toilet
nothing
To make his people happy
Science and technology are the 2 main ones
The United States will make new advances in Internet technology.
The world does not shrink but advances in communication technology make it appear so.
Technology
It was based on 180 city-states in Asia Minor and the Islands which banded together against the Persian Empire under the leadership of Athens. When the Persian threat was resolved, opportunistic Athens converted it into an empire of its own.
He wanted to make his kingdom strong enough to defeat the mighty persian empire.