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Countries cry to become state were completely ignored by political forces. Because of this the countries were provoked, and therefore a strong nationalism movement started in the 19th century. Due to this Germany and Italy unified, and Belgium became an independent country. Many nationalist conflicts weren't solved, meaning there was tension in the and between the European nations.

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What does nationalism have to do with world war 1?

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After the Archduke of Hungary got assasinated by Serbia the Hungarian-Austrian countries and their allies declared war on the Serbian side which later evolved into a war and later on WWI.

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Germany was used to solving their situations and Problems through military ways.

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The Opposing alliance of the Triple alliance  consisting of Britain, France and Russia. More of a friendship rather than the Triple Alliance

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Between Italy, Austria-Hungary and Germany more of an alliance where the countries depended on each other.

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Germany came late in Imperialism and there were no more resourceful colonies to colonize. They then wanted to expand, and used this as one of their reasons. Furthermore they were surrounded by all the strong European Imperialistic countries.

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how did imperialism help cause WW1? how did industrialism help cause WW1?