War becomes the only solution when any other peaceful means to solve a conflict fails.
Explanation:
Some peaceful means to solve a conflict between societies, or within a society are:
Pluralist political representation: in any society, interest differ greatly between groups. Giving each group some form of political representation helps avoid war, and is one of the reasons why most countries today are representative democracies.
Signing treaties: while they sometimes fail to avoid war, treaties are a good way to put in written form, agreements or compromises between two conflicting parties. A treaty is seen as a formal document that ought to be respcted by the signing parties.
Opening up trade: economic integation is a policy that has been used to avoid war. This is because economic interests become integrated, and avoiding war becomes profitable. The Europea Union was founded with the goal of avoiding further conflict within Europe.
When these strategies fail, war often ensues, with all the negative consequences associated with it.
