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9. Once the first declaration of war was made and the alliance system began to kick in, what other countries became

involved?

User Agaz Wani
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1 Answer

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Answer:

Austria-Hungary made first declaration of war against Serbia. An alliance system called the allied powers started to kick in United States, China, Soviet Union, France, Great Britain.

Step-by-step explanation:

Because of assassination of the Austrian Prince Francis Ferdinand and his wife Sophia on June 28, 1914.

User Vold
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