Richardson, Ken. Reich Star
Divergence: 1939 CE
What if: Nazi Germany started a nuclear weapons research program which was capable of producing the bomb by 1943. Also, US aircraft carriers were at Pearl Harbor on December 7, 1941, and the US fleet was crippled. Finally, Hitler was assassinated in 1942, and when the dust had settled, Himmler was running Germany but leaving war planning to the military.
Comments: Role-playing game set two centuries after the "War of Unification" and the ensuing long cold war between Germany and Japan.
Published: Creative Encounters 1991 (0962742805).
Web link: Wotan Trade Station Vogeler-1