United states enter world war 2 1940

Let's say that Germany decides in early 1941 to go with Op Barbarossa despite the USA entering the ww2 in 1940.
They need to deal with Yugoslavia and Greece, help Italians not to loose in Libia, defeat Soviet Union, keep a knife under Vichy's throat so those don't chage sides, keep a sizable garrison from north of Norway down to Spanish border, all while avoiding not to be defeated by RAF and USAAF in mid-1940. Quite a tall order, don't you think?

It would be, but in this scenario the swift conquest of the USSR is even more necessary however difficult. Germany needs to secure the resources to prosecute the war and remove one major enemy. The idea of fully drawing the USSR into the Axis is superficially attractive but even setting aside the ideological issues the Germans understood that they would rapidly be reduced to the status of junior partner, in the same way that Britain found itself beholden to the USA. To be clear Barbarossa in 1940 will almost certainly fail, but the USSR is at the nadir of its military effectiveness, so there is a slender chance of success.
 
It would be, but in this scenario the swift conquest of the USSR is even more necessary however difficult. Germany needs to secure the resources to prosecute the war and remove one major enemy. The idea of fully drawing the USSR into the Axis is superficially attractive but even setting aside the ideological issues the Germans understood that they would rapidly be reduced to the status of junior partner, in the same way that Britain found itself beholden to the USA. To be clear Barbarossa in 1940 will almost certainly fail, but the USSR is at the nadir of its military effectiveness, so there is a slender chance of success.

Barbarossa in 1940 is a non-starter. Whatever Wehrmacht has after conquest of France is in need of R&R, Heer is busy with incorporating French hardware for their needs, industry needs to produce much more of anything - from rifles to aircraft, as well as manpower that need to be trained to use it.
Red Army is not yet deployed on the new Soviet Western border (thus Germans will kill of far less of Soviet divisions and squadrons initially), and Germans need to ship the best part of their assets from west to Romania and what was Western Poland. Not having Romania firmly in their possesion also hampers their situation in 1940. Problem of ever-widening frontline against Russia still remains in any case, wider front requires more men & material to hold it.
 
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