PLEASE HELLP How did imperialism cause ​ World War I ​ ?

A great rivalry developed between the nations of Europe as they attempted to add colonies to their empires.

The colonization of native people increased the number of available troops European countries could call on.

European nations grew more isolated from one another politically as they became more deeply involved in imperialism.

Disputes between colonies forced the nations of Europe into a greater conflict that did not directly involve them.