I did a search and didn't see much on this topic. If there is some info let me know on this thread.
In any case I am presently playing a rather interesting game (US) on HOI II Doomsday. In it history has gone as follows.
To summarize everything goes as it did in OTL up to March, 1939 then Chamberlain - apparently in a last ditch effort to prevent another war in Europe - does not agree to come to Poland's aid if she is invaded by Germany but urges her to instead cede Danzig to Germany in return for peace.
Poland refuses. Germany still has the Molotov/Ribbentrop Pact with Moscow. She successfully invades Poland on September 1, 1939. Poland still falls in three weeks. The Allies refuse to go to war over Poland.
Now, what is the upshot of this? Hitler now has pretty much a free-hand to do as he wants with no western front and no allies. What does he do now that he has had yet another relatively bloodless conquest?
Also, how does this effect the war in the Pacific?
What are the short-term and long-term effects of Britain an France not going to war in 1939?