Serbia didn't drop out of World war I. After having initial success in the battles of Drina, Kolubara and Cer ( which were first allied victories in the war) against Austro-Hungarian troops, Germany joined the invasion. Serbian army was then forced to retreat through Albania to Greece, where it joined its allies and reopened the Solun front. Serbia came out of the war victorious.
No, Serbia was not part of Russia during World War 1. Serbia was an independent country that was allied with Russia during the war.
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Yes, Russia supported Serbia during World War 1.
Austria-hungary attacked Serbia
France and Great Britain allied with Serbian during World War 1. Serbia was the first country to be attacked in World War 1.
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The 1st country to declare war on Serbia was Austria-Hungary.
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No. Serbia never occupied other nations.
The US entered the war on April 6,1917