Six:
1. Upper Mississippi
2. Arkanas River
3. Illinois River
4. Missouri River
5. Ohio River.
6. Red River
I think that the question asks about the time of the War in Bosnia and other parts of Yugoslavia in the first part of the 90s. The Serbian soldiers that committed mass murder of Bosnian population, mostly men, referred to this as "ethnic cleansing" which sounded better than "genocide"
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Fix the foundation if that does not wrk find a material too help stabilize the soil hope this helps
Deforestation, that would be clearing the land leading to desertification
