England,United States and China is your answer
Italy, Fascist Spain, Japan, Germany, and some others, including their colonies, were part of the axis power. All others that participated the war is part of the Allied powers.
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They can be settled by wars where whoever wins, gets what they want. But a common way to solve a conflict is a negotiation. Countries will negotiate until they both are happy with the result.
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The answer to question number 5 is A.