Well that’s because D-Day was a death blow. The combination of the US and British winning air superiority and the Soviets with a shit load of material aid destroyed the German ground forces.
It is very unlikely that Either America or the Soviets or the British Empire could have defeated Germany by themselves. The Americans would not have had a secure base of operations and Britain by itself could only equal Germany with Germany having all the resources of most of continental Europe at its disposal. The same was true for the Soviets.
At best, by themselves the Soviets May have ejected Germany from its territories and Britain with its great empire and naval and air superiority could have defeated a German invasion and America, by itself would have been pretty much impotent.
In fact, I would argue that once the British and Americans established air superiority, an unproven theory at that time, which the Soviets contributed little to, the Americans and Brits would still have defeated Germany and without the Soviets massive casualties. Certainly their casualties would have been far greater but they would have won.
In fact it is now pretty much universal doctrine that air superiority must be established and communications and transportation infrastructure destroyed for a land invasion to succeed.
I would also point out that most historians agree that both El Alemein and Stalingrad were the major pivotal turning points of the war in Europe and though Stalingrad was an unmitigated disaster for Germany keep in mind that the main strategic mission of the southern German Force was to capture the Caucasuses oil fields. The victory at El Alemein was strategically as important as it denied Germany access to Middle Eastern oil. Those combined victories at approximately the same time starved Germany of petroleum which was catastrophic to the German war effort. Had Germany won at El Alemein the loss at Stalingrad would have been mitigated by opening up Middle Eastern oil to the Germans and they would have gained control of the Suez canal. That would have been devestating to Allied war efforts so you can’t understate the importance of the victory at El Alemein in addition to Stalingrad.
I agree with about 90 percent of what you said.
I think to some extent we are talking past each other.
The question I was exploring were:
What was that status of the war when the D Day landings occurred? (German armies in disarray, headed for defeat, and in headlong retreat in the face of the Red Army).
What was the event that can credibly said to have ended the prospect of German victory in WW2? (The Soviet defeat of the German Army at Stalingrad...though you could say the Battle of Kursk is really what ended any ability of the Germans to conduct offensive operations. )
Of course it cannot be denied that other campaigns across Europe, North Africa, the Strategic bombing campaign, and the North Atlantic had both strategic and tactical important. So if the question we are asking is is:
Did it take a concerted effort by the Anglo-America-Soviet alliance to defeat Nazi Germany? Yes, undoubtedly
Sidebar: I always thought it was a fantasy that the German North Africa Korps would have marched onto the Saudi and Iranian oil fields. If the Nazis could control the Romanian and Caucuses oil fields, I don't know why they would need to march on Arabia and Iran. Seems a little far fetched. I always thought North Africa was more of an Italian interest, and the Germans' got involved by proxy with their Italian allies.
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