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Manchuria is your answer :)
Which is B on plato :)
By forming various organizations.
The European Union, for example, unites Europe (Minus Britain these days) under one banner, thus preventing fighting.
A more direct example is the North Atlantic Treaty Organization. NATO protects the "North Atlantic" and Europe from terrorists and invading countries by using the combined military strength of multiple nations.
Horses brought over by the Europeans made hunting buffalo easier.
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Political realism is the policy that your looking for