Answer:
It was pan-Slavic nationalism that inspired the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, an event that led directly to the outbreak of World War I
Explanation:
If this hadn't happened the war would have taken longer to form making it more likely that we would join the war earlier on.
Because it was a church day <span>On Sundays the military relaxed discipline
somewhat, allowing soldiers and sailors to go on leaving for the weekend,
or to sleep in an extra hour in the morning.</span>
Because it involved countries all over the world, there was new technology such as chemical warfare, tanks, planes, etc. and it was unrestricted warfare. The countries were attacking civilians as well. Also there were diseases.
