AHC/WI: Western Allies take all of Germany

With any POD after America's entry into WW2 (December 8th 1941), have the WAllies reach Berlin first and subsequently occupy the entirity of Germany's pre-war territory.

What has to happen for this to occur? The Soviets doing even worse on the Eastern Front? The WAllies receiving an extra stroke of luck/genius or two? A Japan-screw in the Pacific? Maybe an earlier completion of the Manhattan Project?

And should the WAllies conquer the entirity of the Reich, what happens to post-war Germany? Unified denazification or permanent/temporary partition? What would a possible WAllied partition of Germany look like? Would Germany lose territory to her neighbours? And what effects would this "Mega-FRG" have in the Cold War?
 
I think it's going to be very hard for the western allies to conquer all of Germany (including for example East Prussia). Had Market Garden been more successful and the three-pronged assault into Germany as envisaged by some come to pass, Western Allied forces might have reached Berlin by Christmas 1944 and gone on to occupy much of what would become the GDR (perhaps meeting the Russians on the Oder rather than the Elbe) as well as Prague and Vienna.
 
Western Allied forces might have reached Berlin by Christmas 1944 and gone on to occupy much of what would become the GDR (perhaps meeting the Russians on the Oder rather than the Elbe) as well as Prague and Vienna.
GDR past the Oder-Neisse Line plus East Austria?
 
Maybe Hitler dies after D-Day(within a week after) and whoever takes over decides to send whatever they can eastward so as to save what they can? You could potentially end up with the dividing line being Poland even if the strip the western front down to nothing.
 
GDR past the Oder-Neisse Line plus East Austria?

Yes, I meant the Oder-Neisse Line. It's just about achievable by January 1945 IF the allies can get round Berlin quickly and the Russians are further east.

I still think the Russians would get an "interest" in a four-power occupied Berlin and they would obviously get those areas of Germany which were ceded to Poland.
 
Alright, assuming the WAllies take Germany (maybe with the exception of East Prussia), would this mean an implementation of the Roosevelt Plan?

668px-Duitslandroosevelt.png

Would there be any chance of Germany ever reunifying in such a scenario?
 
Easy - the USSR collapses in 1942-1943, due to the failure of the Stalingrad counterattack (along with the OTL defeat at Rzhev). A Vichy-type rump state rules Siberia, Central Asia, and eastern Russia.

Then it's entirely up to the US and Britain to defeat and occupy Germany. Which they will do, having far more manpower and industry and natural resources, and better technology.
 
I think the allies might be less wullling to allow a German reunification if they have to defeat Germany without the USSR.

The saying goes “Russian blood, American Steel and British Spies”. When that Russian blood comes from the WAllies, they will be incensed. I could see the US putting more pressure on South America to join send bodies.
 
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