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The Persians to only the west - what is today's Pakistan. They brought a veneer of Persian culture to the sub-continent.
Because the world's primary energy source is oil, and the majority of the world's oil must be transported through the Persian Gulf on supertankers.
Which Gulf War? There were at least three of them.
Because the Persian Army wanted to defeat the Greek city-states that supported the uprisings in Ionia, part of modern-day Turkey, against the Persian Empire.
Greece and the Persian Empire.
The Persian expeditionary force was defeated and went home.
The Persian Empire was important to Western Asia, the Mauryan Empire was important to India.
They stopped the expansion of Persian control into Europe.
Yes it was very important.
They were so important because it led to the destruction of the Persian Empire.
There were no territorial changes after the conclusion of the Iran-Iraq War (1980-1988).
The outcome set a limit to Persian expansion to the west.
A very important person
The most important during the 50 years of war which turned the result was the defeat of the Persian navy at Salamis in 480 BCE
Destruction of the Persian fleet meant the eventual failure of the Persian attempt to incorporate the mainland Greek city-states within the Persian Empire.
Very important, most of OPEC 's member countries are there.
It dominated the Fertile Crescent and its resources.