Last Bastion of Democracy
Continuing off a German victory in the battle of London, the Axis powers now turn their sights to their final enemy. One who hasn't faced invasion from a foreign force in over a hundred years, America. With Britain defeated, the Germans have no reason to go to war with the USSR for the time being as they aren't as desperate now for oil and taking the fields in California or Texas would serve the same purpose. So they have no need beyond ideological to invade the USSR at the same time as the US. (the main scenario is supposed to be WW2 cover image just gets the point across.)
