imperialism
explanation:
A policy by which strong nations extend their political, military, and economic control over weaker territories.
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
All of those answers are wrong it was Sultan Mehmed II????
Have a brainly day! :)
I'm sorry I couldn't help you