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.
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D) granting former slaves suffrage.
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Um no i havent, but I can help you if you need help considering my IQ i'm willing to help if you need it.
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