How World War 1 Started?

World war 1 started the country of Austria-Hungary annexed from Bosnia-Herzegovenia. Shortly after this occurred, the assasination of Archduke Franz Ferdinand took place. This assasination took place on behalf of the liberal group of a Serbian nationalist named Gavrilo Princip. World war 1 began shortly after this took place. Austria-Hungary eventually joined forces with Germany, while Russia, Great Britian, and France fought against them. Eventually Russia pulled out of the war because of the Russian Revolution taking place at the sameitme.