Federal government possesses the power to do those things
Answer:
Jade I think it is the last one. I am not positive. If that is wrong I am sorry.
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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