What geographic factor influenced the changing political borders in the Indus River Valley?
developments in transportation
damages from natural disasters
O conflict over control of waterways
technological advancements in farming

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Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.