Answer:
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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.
Hello,
The two groups that headed west were the settelers from america and the natives. They headed there to one explore and two for the amount of free land and gold.
The Invasion of Mexico, was an armed conflict between the United States of America and the United Mexican States