Nationalism: Nationalism refers to strong pride, loyalty, or devotion towards one's own nation or ethnic group. It can be a driving force behind actions that lead to conflicts.
Archduke Franz Ferdinand: Archduke Franz Ferdinand was the heir to the Austro-Hungarian Empire whose assassination by Gavrilo Princip in 1914 served as a catalyst for World War I.
Black Hand: The Black Hand was a secret society based in Serbia that aimed to unite all Serbian territories into one state. They were responsible for organizing the assassination of Archduke Franz Ferdinand.