Answer:
imperialist competition
Step-by-step explanation:
The main cause for the World War I was the imperialist competition between the nations. Some of the nations thought that the political and economic influence and power and not redistributed evenly, and that they should be, so Germany and Austria-Hungary wanted some of the colonies that the other nation controlled. That was not seen fondly by the nations that had colonies, as they fought for those colonies and invested a lot in them. The tensions grew even more because of that so after the assassination of Franz Ferdinand, it was all triggered and the war started.