How did a political assassination in June 1914 lead to a world war?
Archduke Franz Ferdinand of Austria was assassinated in 1914 by a sort of mafia that wanted to break off Austria-Hungary’s South Slav Provinces to be joined with Yugoslavia. With this intent, Archduke Franz Ferdinand was assassinated, but the Austria-Hungary government wasn’t pleased. Austria-Hungary then declared war on the kingdom of Serbia, who didn’t fulfill all of the conditions of an ultimatum sent soon before.
Here is where the world war kicked in; Austria had several allies, and when they declared war, Russia mobilized many troops in their support. Germany then issued an ultimatum to Russia ordering that they withdraw. Russia refused, and so Germany was brought into the war.
From this point, the war escalated. Each combatant had allies, and when these were brought in, their allies had to join as well. Thence nearly all of Europe erupted into a massive struggle to defeat the other half of it, resulting in the loss of millions and millions of lives.