Serbia is a country located in southeastern Europe. It was involved in the start of WWI due to the assassination of Archduke Franz Ferdinand of Austria by a Serbian nationalist.
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Archduke Franz Ferdinand: He was an Austrian royal whose assassination by a Serbian nationalist sparked WWI.
Black Hand: This was a secret military society formed by members of Serbian army who were involved in political assassinations including that of Archduke Franz Ferdinand.
Balkan Wars: These were two wars fought on Balkan Peninsula between Balkan League (including Serbia) and Ottoman Empire before WWI which set stage for tensions leading to WWI.