In Dragon Ball Z: Fusion Reborn (1995) all villains escape from hell and terrorize the earth, including Adolf Hitler. This means the holocaust is a canon historical event in the Dragon Ball universe
In Game of Thrones, the Iron Born, a kingdom of pirate vikings, decides not to attack the Westlands, with its treasure fleets and pillagable coast, and instead goes after the North, a vast trackless wilderness with no discernible wealth. This is because they are stupid