How about some 1970s steampunk?
Publisher Blurb: "Oswald Bastable visits an alternate 1904. Here, he discovers that most of the Western world has been devastated by a short, yet horrific, war fought with futuristic devices and biological weapons. An Afro-American Black Attila is conquering the remnants of the Western nations, destroyed by the wars, in an attempt to bring civilization and social order."
Series: Oswald Bastable: Book 2