There are many factors that led to the outbreak of WWI and they all have their importance in history of WWI, but there are three factors that I think are quite important.
1. The Ultimatum sent to Serbia from Austria-Hungary.
On July 23, 1914, Austria-Hungary sent an Ultimatum to Serbia with 10 really tough demands; they gave Serbia only two days to revise and expected Serbia to refuse the Ultimatum completely. But the Serbs agreed most of the Ultimatum politely, but they did not agree with the 6th demand, which was to send Austria-Hungary polices into Serbia and arrest all the terrorists t…
