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.
Answer:
Office of Price Administration
Explanation:
The functions of the OPA were originally to control money and rents after the outbreak of World War II.
The answer would be Senate Majority Leader.
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