How did European imperialism contribute to the start of World War I?

(can you wright a short answer version?)

A short answer is that becasuse of the imperialism of European nations there was a growing dissatisfaction in those nations who did not have any colonies. Due to not having colonies they argued for a redistribution in colonies so that it would be more equally and fairly shared. Because this didn't happened (among with A LOT of other reasons), World War I ensued.