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How did the conflict expand to draw in much of Europe

User Rfedorov
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Answer:Austria-Hungary declared war on Serbia on July 28; Russia (Serbias protector) began mobilization; Germany (Austria-Hungary chief ally) demanded Russia stop. Russia refused. Russia's ally (France) began readying troops as did Germany. August 1, Germany declared war on France

Step-by-step explanation:

User Stevenpcurtis
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