Hello people of town! I am your next leader, Franz Ferdinand.
Franz Ferdinand was the heir to Austria-Hungary's throne
One day when Franz Ferdinand was driving down the street he got assassinated by a teen named Gavrilo Princip. Serbia hired him for the assassination. Austria-Hungary then declared war on Serbia
Serbia and Austria-Hungary were on different sides for World War 1. Serbia had Russia, Britain, and France on their side while Austria-Hungary had Italy, Germany, and the Ottoman Empire. Since Serbia and Austria-Hungary went to war so did their allies starting WW1.