The Tigris provided fresh water in order to grow crops they created things called leeves that transport water to supply it. The eurphrates did the exact same thing they provided water for the crops. Hope this answered your question.
B - during the Mauryan Empire
Asoka was the last major emperor of the Mauryan Dynasty. He reigned between 265-238 BCE and died in 238 BCE.
D settle in one place, they could then properly sustain themselves :)
The biggest effect of the French and Indian War was that it taught the 13 American colonies how to fight together. Before this war there was a mutual distrust between the thirteen. The next common foe would be Great Britain in the American Revolution.
This war also left Great Britain in extreme financial trouble within their military which of course will be a huge advantage for the colonists in the Revolution.
Great Britain tried to tax the colonists to make some money to be able to afford their military but this backfired when the colonists asked for representation in parliament-were denied- and started tossing tea off ships in Boston.
Therefore, we can really thank the French and Indian War for paving the way to our freedom.