[Dvjkefdw]

The only thing I really know about the causes of WW1 is the assassination of Franz Ferdinand as a catalyst. I think it is probable that Prussia would not have declared war on Serbia because of that but who knows.

Well and then a bunch of alliances that cause nations to declare war on each other. I was thinking there must be more to it then that. I'm not sure what the situation was with Austria and Serbia prior to that though.

From what I have read about the matter, the assassination was carried out by a Serbian nationalist, so I think that, if anything, the Prussians would have been more ruthless in putting down the nationalist waves that shook the Austrian sphere so badly at the end of the XIXth century. It goes without saying that they would have had their hands full on it, and perhaps would have prevented them from competing with the UK as for the dominance on the sea and the African/Asian colonies.