What was the main cause of world war 1

To be honest there could be many qualified answers to this question.  With that being said I believe the cause was due to the difference in policies. Militarism, Alliances, Imperialism and Nationalism were all scatter around the globe  and quickly problems arises from those.

World War 1 started when Archduke Franz Ferdinand of Austria was assassinated on June 28, 1914. This was the immediate cause but there were a series of events which triggered the war. See below for more information and facts about how World War 1 started.

Brainliest please?

they both built pyramids.

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.