It raises big challenges for the Allies...imnsurmountable ones in fact.
The Wages of Destruction, Adam Tooze, page 424:
With hindsight it is hard to avoid the conclusion that after the defeat of France Germany would have done better to adopt a defensive posture, consolidating its position in Western Europe, attacking British positions in the Mediterranean and forcing the British and the Americans to bomb their way onto the Continent. Given that the Red Army ultimately proved to be the nemesis of the Wehrmacht, this is hard to deny. But what is too often ignored in such counterfactual arguments is the growing awareness in Berlin that, even after the occupation of Western Europe, Germany did not have the upper hand in a long war against Britain and America. The chronic shortage of oil, the debility of the European coal mines and the fragility of the food chain, made it seem unlikely that Germany would in fact be able to 'consolidate' its conquests of 1940 without falling into excessive dependence on the Soviet Union. Even if this were possible, the combined manufacturing capacity of Britain and America vastly exceeded the industrial capacity currently under German control and this, in turn, spelled disaster in a protracted air war. The German army, on the other hand, had proved its ability to achieve decisive victory against what were thought to be the strongest armies in Europe. When we bear this range of factors in mind it is easier to appreciate why a defensive strategy seemed like a second-best in the autumn of 1940. After the defeat of France, the dream of a gigantic land empire seemed within reach, and, given the industrial strength looming on the other side of the Atlantic, there was no time to waste.
The same book, page 410:
The territories that Germany had conquered in 1940, though they pro-vided substantial booty and a crucial source of labour did not bear comparison with the abundance provided to Britain by America. The aerial arms race was the distinctive Anglo-American contribution to thewar and it played directly to America's dominance in manufacturing. But though the disparity in aircraft deliveries was extreme it was not untypical. A similarly vast gulf was also evident in relation to energy supplies, the most basic driver of modern urban and industrial society.Whereas the Anglo-American alliance was energy rich, Germany and its Western European Grossraum were starved of food, coal and oil.The disparity with respect to oil was most serious. Between 1940 and 1943 the mobility of Germany's army, navy and air force, not to mention its domestic economy, depended on annual imports of 1.5 million tonsof oil, mainly from Romania. In addition, German synthetic fuel fac-tories, at huge expense, produced a flow of petrol that rose from 4 milliontons in 1940 to a maximum of 6.5 million tons in 1943. Seizing thefuel stocks of France as booty in no way resolved this fundamentaldependency. In fact, the victories of 1940 had the reverse effect. Theyadded a number of heavy oil consumers to Germany's own fuel deficit.From its annual fuel flow of at most 8 million tons, Germany now had to supply not only its own needs, but those of the rest of Western Europeas well. Before the war, the French economy had consumed at leas t5.4 million tons per annum, at a per capita rate 60 per cent higher than Germany's. The effect of the German occupation was to throw France back into an era before motorization. From the summer of 1940 France was reduced to a mere 8 per cent of its pre-war supply of petrol. In an economy adjusted to a high level of oil consumption the effects were dramatic. To give just one example, thousands of litres of milk went towaste in the French countryside every day, because no petrol was available to ensure regular collections. Of more immediate concern to the military planners in Berlin were the Italian armed forces, which dependedentirely on fuel diverted from Germany and Romania. By February1941, the Italian navy was threatening to halt its operations in theMediterranean altogether unless Germany supplied at least 250,000tons of fuel. And the problems were by no means confined to the Reich's satellites. Germany itself coped only by dint of extreme economy. In late May 1941, General Adolf von Schell, the man responsible for the motor vehicle industry, seriously suggested that in light of the chronic shortage of oil it would be advisable to carry out a partial 'demotorization' of the Wehrmacht. It is commonly remarked that the Luftwaffe suffered later in the war because of the inadequate training of its pilots, due in large part to the shortage of air fuel. But in 1941 the petrol shortage was already so severe that the Wehrmacht was licensing its soldiers to drive heavy trucks with less than 15 kilometres of on-roadexperience, a measure which was blamed for the appalling attrition of motor vehicles during the Russian campaign. Shortages made themselves felt across the German economy. So tight were fuel rations thatin November 1941 Opel was forced to shut down production at its Brandenburg plant, Germany's largest truck factory, because it lacked the petrol necessary to check the fuel pumps of vehicles coming off theassembly line. A special allocation of 104 cubic metres of fuel had to bearranged by the Wehrmacht's economic office so as to ensure that therewere no further interruptions.
I'm not convinced that the Alllied situation would be factually impossible to sustain. Authors like Tooze belive just in the opposite, therefore this is not a concensus among historians. However, you did provided arguments that I found interesting.
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