With World War I an entire system of ideas how wars work collapsed. Suddenly it was no longer mostly soldiers who had to fight. War became an engagement of every day's life. Everybody got involved.
Propaganda therefore changed as well. The campaigns were no longer temporarily and recent but had to be planned for years. Who failed in organizing it or used the wrong keywords failed. Masters of modern propaganda became the British, whereas the Germans failed completely in the beginning.
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Louis XIV. (1643-1715) became King of France when he was still a young boy. He centralized all the state's power to the crown and created a state of absolutism. In this respect Louis' most famous sentence was: L'état c'est moi. (= The state am I). During his reign the most talented and respectable men in art as well as in philosophy and policy worked for the monarchy. His favor for luxury and the steady wars with other European empires ruined the state morally and financially, but for the history he is still called Roi Soleil (King of the Sun).