Final answer:
The decline in the production of folk music did not aid the trend of Romantic nationalism.
Step-by-step explanation:
The decline in the production of folk music did not aid the trend of Romantic nationalism. Romanticism, an artistic and literary movement that glorified nature, common people, exotic places, and the historical past, was closely tied to the folk movement. The folk movement believed that the essential truths of national character were preserved in the traditions of the common people. Therefore, the decline in the production of folk music would not have aided the trend of Romantic nationalism.