We just had a very unhistorical game. US, Germany, Italy and Sovjet Union were played. US player was very inexperienced. Knowing that I decided to end the game quickly.
I played Germany, attacked France and simultaniously landed in UK in March '36. By summer '36 I had set up Vichy. However, my transports were sank by the British, so I couldn't advance but UK couldn't throw me out either. My advance was further hindered by the fact that UK built ~150 militia after my landing. 
I noticed that US still had only 5 divs in early '37, so I landed in Canada and after I had shipped 10 mech inf there I attacked and conquered US in no time.
After a reload the US player took control of UK. This actually did help me quite a lot.
I couldn't break through the AI defences, but the human player would just throw a suicide militia wave after the other against me and therefore allowed me to conquer UK in no time.
SU took its only chance and DOWed me shortly after I attacked US. Italy and I managed to stop SU outside Berlin, and after a few decisive battles SU surrendered in autumn '37.
I noticed that US still had only 5 divs in early '37, so I landed in Canada and after I had shipped 10 mech inf there I attacked and conquered US in no time.
After a reload the US player took control of UK. This actually did help me quite a lot.
SU took its only chance and DOWed me shortly after I attacked US. Italy and I managed to stop SU outside Berlin, and after a few decisive battles SU surrendered in autumn '37.