Empire of Japan

A solemn nation, they do not mourn the deaths of their own, but of their enemies. Enemies to the Emperor! It turns out they are pretty chill now but they used to be crazy. Like, fanatical...

Popular Culture
After its supposed defeat in WW2, Japan devised a new way to weaken the United States Army. It created Anime to keep all military-aged males out of service so it could decrease their numbers and hope to attack with increased effect. This somewhat worked, as American males would only come to Japan for the Anime culture and other weeb stuff.

The nation had America so positively indulged in Japanese culture that Japanese naval high command was portrayed as a group of actual humans in the 1970 film "Tora! Tora! Tora!".