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*Austria declared war on Serbia

*Germany supports Austria

*Russia helps Serbia

*Germany declares war on Russia

*France joins Russia

*Germany invades Belgium.

*Britain declares war on Germany for invading Belgium because Britain & Belgium had an agreement of protection

*then Italy, Japan and USA

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13y ago

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More answers

Japan, the US, and the Italians. ( Italy.)

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12y ago
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Germany, Austria-Hungary, Russia, Serbia, Great Britain, Ottoman Empire, Australia, Canada, United States of America, Ukraine

Italy, france, and japan. xox

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13y ago
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Q: What countries joined World War 1?
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