The capital was Belgrade.
No. Serbia never occupied other nations.
Serbia wasn't allied with Belgium
Serbia was in WWI because Austria-Hungary declared war on them.
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Berlin. (Bonn was the capital of West Germany, 1949-1990.)
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Austria-hungary attacked Serbia
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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