What caused World War One?

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Militant nationalism across Europe raised the appetite for war.

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Increasing European militarization made leaders more inclined to see war as an attractive strategic tool.

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Most states believed war could help allay domestic political problems.

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Imperial states sought to protect their empires from rivals.

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Arms races between European countries made neighboring countries worried that they could be vulnerable to attack.

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European states built alliance systems to defend and further their interests. As conflict emerged between some states, others joined to protect those alliances.

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