Excerpts from Books and Wikipedia
"Princip was a Serbian nationalist and member of a terrorist organization called 'Black Hand,' whose aim was independence for southern Slav peoples in the Austro-Hungarian Empire.… In the meantime Austria-Hungary accused Serbia of complicity and secured Germany's support in delivering an ultimatum that would effectively strip Serbia of its independence. With just two minutes to go before the end of a 48 hour deadline, the Serbs acceded to almost all the demands and offered to accept international mediation. The offer was rejected. World War I had ground into gear." [Furtado: 1001 Days]