contestada

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

Respuesta :

Brain741

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.

Explanation:

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

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