Answer:
The development of a new national Constitution
(Randolph and Madison gathered with other delegates from the states at the Constitutional Convention to create a new republican governmental system)
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
Mainly just to get spices
The three g's
glory,gold,god