What stared. World War 1?

Answer 1

World War I was started by several interlocking causes. First, the pride and ambition of nations and social groups was a cause, as war was seen as a means of securing political and economic gain. Second, the complex alliance-system governing the conduct of nations throughout Europe was a cause, as it required allies to join forces with combatant nations even if the conflict wasn't initially a concern for one or more of the allies in the alliance in question.

Answer 2

World War I was started by several interlocking causes. First, the pride and ambition of nations and social groups was a cause, as war was seen as a means of securing political and economic gain. Second, the complex alliance-system governing the conduct of nations throughout Europe was a cause, as it required allies to join forces with combatant nations even if the conflict wasn't initially a concern for one or more of the allies in the alliance in question.