When putting together the alt-history military science fiction short story anthology Weird World War III, editor Sean Patrick Hazlett did so with the one limitation that the titular conflict be between the U.S. and the Soviet Union. But in the following email interview about the follow-up, Weird World War IV (paperback, Kindle), Hazlett says that while it is about Earth’s fourth all-invitational conflict, the previous restriction as to the participants was lifted.