How did the death of Archduke Franz Ferdinand lead to global conflict?
When Archduke Franz Ferdinand was assassinated Austria-Hungary wanted to attack Serbia. They knew that if they attacked Serbia that Russia would defend Serbia. SO, they asked Germany to back them up if Russia were to attack them. Germany said Yes, so Austria-Hungary attacked Serbia, and Russia declared war on Austria-Hungary, and Germany declared war on Russia. Thus, WWII was started.