I am sort of confuse becouse this is phrased as one question (at first i thought you where talking about the recent fight about not putting in a pipeline but i relized you said why DID)
So i will split it into 2 Native americans fought for land becouse for one they needed a place to live and second they belived the great spirit wanted them to live where they did
They fought for water to live/drink
The answer is true.
The Midwest is called the "bread basket" because it had fertile soils which produced bountiful amounts of crops like wheat and oats for the farmers.
9 countries(Armenia,Azerbaijan, Belarus, Moldova, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, Uzbekistan)
Yep because archaeologists found it