A war like World War I, which started as a limited conflict but expanded quickly as alliances were engaged, is an example of what kind of war?

Name: A war like World War I, which started as a limited conflict but expanded quickly as alliances were engaged, is an example of what kind of war?
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A catalytic war starts as a limited conflict but expands as other parties are drawn into the fray, often due to alliances and obligations, as was the case with World War I.

A War Like World War I, Which Started as a Limited