How did gavrilo princip and black hand contribute to World War 1?

Gavrilo Princip, a member of the nationalist group known as the Black Hand, assassinated Archduke Franz Ferdinand of Austria-Hungary on June 28, 1914. This event triggered a series of diplomatic conflicts and alliances, leading Austria-Hungary to declare war on Serbia. The assassination and the subsequent actions of the Black Hand highlighted the tensions in the Balkans and the larger web of alliances in Europe, ultimately setting off the chain reaction that led to World War I. The assassination is widely regarded as the immediate catalyst for the war.