Long before the outbreak of hostilities Prussian-German conservative elites were convinced that a European war would help to fulfil Germany's ambitions for colonies and for military as well as political prestige in the world.

The actual decision to go to war over a relatively minor international crisis like the Sarajevo murder, however, resulted from a fatal mixture of political misjudgement, fear of loss of prestige and stubborn commitments on all sides of a very complicated system of military and political alliances of European states.

In contrast to the historian Fritz Fischer who saw German war aims - in particular the infamous September Programme of 1914 with its far-reaching economic and territorial demands - at the core of the German government's decision to go to war, most historians nowadays dismiss this interpretation as being far too narrow. They tend to place German war aims, or incidentally all other belligerent nations' war aims, in the context of military events and political developments during the war.

https://www.bbc.com/news/magazine-26048324