How popular was George m Cohan before writing World War 1 propaganda songs?

Before writing World War I Propaganda songs, George M. Cohan was already a highly popular and influential figure in American theater. He was celebrated as a playwright, composer, and performer, known for his energetic musicals and patriotic songs such as "Yankee Doodle Dandy." His works, which often emphasized American themes and values, had established him as a key figure in the entertainment industry, paving the way for his later contributions to war propaganda. Cohan's popularity helped amplify the impact of his wartime songs, which resonated deeply with audiences during the conflict.