Above is the cover art of the Japanese animated series, "Girls Und Barrel". This series features the characters participated in a sport called "Barrelery", which as you guessed, is a sport involving barrels, against other schools. Each school is based on different countries involved in the Second Great War such as Tsarist Russia, the German Empire, Austria-Hungary, Great Britain, the United States, and, controversially, the Confederate States, use the Barrels of said countries. This series has garnered some accusations of promoting Freedomism due to a lot of focus on a character that comes from a Confederate States themed school.