Reynard said:
You're saying the "Uranium project" never happened!
http://www.pbs.org/wgbh/nova/military/nazis-and-the-bomb.html
In Mirror World, they in fact do put more effort, maybe discovering the process the US experimented with, and develop the weapon. V-2s with nuclear tips crack the sanctity of
Britain then move on Russia ending the war before the US defeats them and later Japan. At this point we assume central and south american countries openly side with the axis along with internal pro-axis within the US isolating the North America. War over.
When they reach the stars, do they take over in the form of the Eternal Reich or are they contained as the variant of the Solomani? Either way, there are going to be either a lot of slave races or extinct species.
Slavery is more profitable than extermination and ultimately the Emperors don't care about what nation and what people they rule, so long as they have power over them. I think Hitler would have lived out his natural life and then died, and then there would be jockeying for power. if Himmler took over then its likely that the war against the Jews would continue for some time after that, if someone else did, then the chances are that Hitler's prejudice would die with him, other emperors wouldn't necessarily care about the same things Hitler did, but they would like to maximize their power. My guess is the Empire would lose its Nazi identity over the next 100 years either because they cease to care about the Master Race, or they run out of Jews to kill, you might get a Nazi "Kruschev" or "Gorbachev". The late Roman Empire was very different from the Early Roman Empire, so out of tradition, an Empire that was a successor to the Third Reich might have a few Swastikas on their starships, but all they would really care about it maintaining their power, and anything that they see s threatening their power or their Empire, they'll crush!