When did world war 1 start?
user
Do you mean, the first major conflict that took place during the years 1914-1918?
assistant
How did it begin?
user
It began in 1914 with Austria-Hungary declaring war on Serbia, and Russia mobilizing its military to support Serbia.
assistant
When did world war 1 start?
user
Do you mean, the first major conflict that took place during the years 1914-1918?
assistant
How did it begin?
user
There were many factors involved in the start of the war.  One common factor was the assassination of the Austrian Archduke Franz Ferdinand on June 28, 1914.  
https://en.wikipedia.org/wiki/Assassination_of_Franz_Ferdinand_of_Austria
assistant
When did world war 1 start?