Final answer:
Germany's military buildup in the early 1900s heightened tensions in Europe, leading to World War I.
Explanation:
Germany was the European nation whose increase in military forces and armaments during the early 1900s significantly contributed to the rising tensions in Europe. With a rapid rise as an industrial, political, and military force, Germany's actions, along with those of other European nations, set the stage for the events leading up to World War I.
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