Here is what i've gathered from online.
"The Mississippi River flows from its starting point in Minnesota to the Gulf of Mexico, which means it flows south."
I hope i helped, i only researched because i wanted to be sure with my answer.
Is a source of international conflict because, as it falls downwind, the area in which it accumulated is not necessarily the area that will be damaged. So countries must work together to reduce the problem because they are damaging one another's environments.
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Hope This Helps