At school we have long been taught that it was the 'shots in Sarajevo' and assassination of arch duke Franz Ferdinand of Austria-Hungary was the start of The Great War.
But however, I suspect that some of the motives of this documentary is not only to enlighten, but at the same time promote this idea of the 'south slavs' of countries like Serbia and Bosnia is done by the movie creators to support an idea of unification of Serbia and Bosnia and several other countries (such as perhaps Monte Negro). The movie is funded by Serbia on different levels and we are told many times that Bosnia and Serbia consists of primarily the same people.
So it is a very well performed documentary going into depth into the decades before the war and thouroghly describes the advesaries and their different conflicts and interests.
At the same time, I am not sure which parts of the documentary is a documentary and which parts are more motivational talk by Serbia to try to argument for Serbia's reunification of Bosnia and perhaps Yugoslavian grandure.. I feel I have to be a historian to pick apart the documentary part from propaganda or 'wishful thinking' fra Beograd..