The Reichskommisariat Amerika mod adds a decision for Germany and Japan to turn their respective zones of occupation in the USA into puppets, like in "Man in the High Castle", the novel and TV series.
> Please note that you should annex the states you want to turn into your puppet. Then you will get a decision to form the puppet itself. > It is recommended to use the Player Led Peace Conferences mod with this one, to avoid funkiness with AI and puppeting in the peace conference.