I think it would be written documents
Napoleon's conquest was largely fueled by nationalism, which was a relatively new idea that then took hold of Europe in the 1800s and contributed to late colonial efforts around the world. After Napoleon was defeated, the borders of Europe were redrawn to create a more stable balance of power. These nations shifted to more conservative governments to prevent similar revolutions and rebellion. Importantly,
Pretty sure Francis Scott Key wrote it.
However, I can't find who first sung it but I know that Charley Pride was the first to sing it at a Super Bowl.
Hope this is helpful, have a good one.
