In most of these remote areas the borders were purely administrative and movements continued must as before.
Competition over land use - as you mentioned - is probably the cause and mainly due to the growth of the population that must be sustained from the land. Not sure how much water is an (additional contributing) issue there... but you would know about that matter from US history out West with the 'water wars'.
Something has to give... there has to be a loser (and he must lose big).
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