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He ruled most of Western Europe from 768-814. And in 800 he was crowned emperor of the romans
Following the war art generally moved away from realistic to "interpretational", since many artists were beginning to challenge the status quo of art that had existed for hundreds of years prior.
1. mutual defense allies,
2. imperialism,
3. militarism,
4. nationalism,
5. immediate cause: assassination of Archduke Franz Ferdinand