How was the first World War the result of imperialism/colonialism that occurred in the long nineteenth century (1800-1899)?

Explanation: Colonial rivalry was a cause of the First World War. First of all, colonial rivalry led to strained relations among the European powers. Secondly, colonial rivalry led indirectly to the formation and strengthening of alliances and ententes. Italy turned to Germany and Austria when she lost Tunis to France in 1881.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.