Final answer:
The Harlem Hellfighters introduced Jazz music to France during WWI.
Step-by-step explanation:
The Harlem Hellfighters, an all African American military infantry unit during WWI, introduced Jazz music to France. As they were stationed in France for an extended period of time, the Hellfighters performed in numerous concerts and parades, showcasing their unique musical style to the French audience. The enthusiastic reception of Jazz in France during this time helped to popularize the genre in Europe and beyond.
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