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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Large five-sided building in Arlington county, Va., near Washington, D.C., that serves as headquarters of the U.S. Department of Defense, including all three services--Army, Navy, and Air Force. On its completion it was the world's largest office building, covering 34 acres and offering 3,700,000 square feet (343,730 square m) of usable floor space for as many as 25,000 persons, military and civilian.