WW1 was caused by several factors chief among them was nationalism and the type of bravado you display.
No, except in the limited sense that all wars start through some amount of "patriotic" spirit. It was due, rather, to the pride of the German, Russian, and Austria-Hungarian (if that's a word) monarchs. It then brought in France and England because of the secret alliances that had been formed.
(Well, in England's case it wasn't secret, but basically that's why.)
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