Think about what you know of the situation in Europe in the early 1900s. What factors would trigger war among the major European powers?

All five factors could contribute to a wider European war. Changing relationships and fear that one power would become too strong encouraged rival alliances and an arms buildup. Conflicts between smaller nations or an invasion could draw larger powers into fighting, while resentment from earlier conflicts added hostility and made compromise harder. Together, these tensions helped create conditions in which a local crisis could become a major war.

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