We'll start with the facts and work back - it may make it all the easier to understand how World War One actually happened. The events of July and early August 1914 are a classic case of "one thing led to another" - otherwise known as the treaty alliance system http://www.firstworldwar.com/origins/causes.htm
A good link Annie; I'm happy to see that the author included Bismarck and the German Unification war as , if not the precursor, but certainly setting the stage for WW1. Most people (not historians) just look at the assassination and the treaties as the cause and stop there. ASIDE: got 1391 BWIR names off Geoff's SE!
Good ! ... I'm glad you think that !! In answer to your aside .... you've got your work cut out for you now !! ... you'll be sorry you started ... it's very addictive you know ?? Annie