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
Karl Marx believed that capitalism would eventually stagnate due to contradictions and will eventually lead to socialist policies. He also thought that the only way capitalism could be overcome was via revolution. (As Marx thought everything else should be settled by)
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Answer:
letter C.The population of the country would quickly overwhelm its natural resources
This is a political example because the declaration of independence falls into the political category