What did Harold D. Lasswell examine in Propaganda Technique in the World War?

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In his 1927 book Propaganda Technique in the World War, the American political scientist Harold D. Lasswell provided a dispassionate description and analysis of the massive propaganda campaigns conducted by all the major belligerents during World War I.1

This work is recognized as a significant contribution to the study of propaganda, marking an advancement in the field from lore toward a more scientific approach. By examining these campaigns, Lasswell helped establish a foundation for later social scientists, historians, and psychologists to analyze various forms of military, political, and commercial communication.1