Question

europe on the eve of war
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a(n) is when one country increases its army because others did.
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Explanation:

In the context of Europe on the eve of war (especially World War I), an "arms race" is the term for when one country increases its military (army) in response to other countries doing the same. This concept relates to political and historical contexts, fitting the Social Science subfield of History (or Politics) as it's about pre - war European political - military dynamics.

Answer:

arms race