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The proximate cause of WW1 is the assassination of Archduke Franz Ferdinand. There are four main causes of the starting of WW1. They were Militarism, Alliances, Imperialism, and Nationalism. In militarism countries aggressively built their nations armed forces. For the alliances, each nation in the allies protected the others. Imperialism is when the countries competed to control other colonies, and nationalism is the devotion to your nation. These are the four main causes of WW1.

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13y ago

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