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summarize the 3 main historical events leading up to world war i.
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the three main historical events leading up to world war i were:

1. the formation of alliances: european countries formed alliances with each other for protection, which led to a complex web of alliances that divided europe into two major blocs: the triple entente and the central powers.
2. imperialism: european powers were competing for colonies and territories in africa and asia, which created tensions and rivalries between them.
3. the assassination of archduke franz ferdinand: on june 28, 1914, the heir to the austro-hungarian throne, archduke franz ferdinand, was assassinated by a serbian nationalist, which sparked a chain of events that eventually led to the outbreak of world war i.
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