Serbia wasn't allied with Belgium
The capital was Belgrade.
Serbia was in WWI because Austria-Hungary declared war on them.
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In 1914 it had 38 colonies!!:D
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Austria-hungary attacked Serbia
World War 1 never had colonies, nor has any other war before or after it. It did however cost the nations who fought in it numerous colonies, most notably Germany, who lost large possessions in Africa and Asia.
Germany was the first country to declare war on Serbia in World War 1. The other countries were pulled into the war because the had alliances with either Serbia or Germany.
The 1st country to declare war on Serbia was Austria-Hungary.
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