Well some rivers in Europe are used to transport goods. Sometime people even travel on them. River also can provide power.
I believe it would be chimpanzees with the rage disease
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The Good Neighbor Policy was the foreign policy that was led by President Franklin Roosevelt and his administration regarding the countries of Latin America. The United States wanted to have good relations with its neighbors, especially at a time when conflicts were beginning to take hold, and this policy was more or less meant to gather support in Latin America. Through the Good Neighbor Policy, the United States was to keep its eye on Latin America in a more peaceful way than in the past. This in fact ended with unpopular military interventions and switched to other methods to cope with the impacts of Latin America: pan-Americanism, support for strong local tenants, national guard training, economic and cultural interference, export-import bank loans, and monitoring of finance and political subversion.
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Very many.
85% - 95% of Native Americans have died due to disease from Europe, with Europeans exploring the New Continent, and animals being brought over from Europe, most couldn't fight the diseases.
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When the economy collapses