Is war necessary

It's not!

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When one country needs to defend itself from the aggression of another, war has traditionally been the only recourse.

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Many times, force must be met with force in order to maintain the vital interests of a nation or people. Unfortunately, it is often used as a means of achieving a political agenda. This was the history of the world until after World War II, when all-out wars between countries became limited by the potential of weapons of mass destruction.