I would agree that the pooling of man power was an important resource that was pooled between the allies. As someone else has mentioned American factories were able to produce war materials without the threat of being destroyed by bombs.
The United States sent war materiel to Britain and the Soviet Union under Lend-Lease in the early 1940's, before the Pearl Harbor attack. Continuing to send materiel became difficult after Germany declared war on the US, since shipping from North America became more and more of a target by the German submarine fleet. By 1943, the Battle of the Atlantic had been won by the Allies, and unrestricted shipment of not only the materiel of war but food and other domestic items continued to flow uninterrupted to Europe. Some of the technological advances, surprisingly, flowed from Europe to North America, notably the development of radar and sonar, developed in Britain and advanced in the US.
I agree with the above post. It was not uncommon to find British units and American units on the same battlefield, fighting right next to each other, with the Brits outfitted in American Sherman tanks. The military command structure for Britain and the US was unified under Dwight Eisenhower, so they pooled manpower, and the US war industries kept everyone supplied with materiel.
There was also cooperation in naval operations, convoy operations and escort duty between the British and Americans to deliver those supplies to ports in Britain and later France and the Soviet Union. Medical units also cooperated, with American and British doctors treating their own soldiers and allied counterparts alike. Cooperation with the Soviet Union was pretty much limited to supplies, mostly trucks. So other than making the Red Army a little more mobile, they pretty much fought on their own outside of some general agreements on strategy.
To me, the major example of the Allies pooling their resources was when the US provided war materials to the other main allies (UK and USSR) through the Lend-Lease program. I guess you could say that the Russians, in particular, used their manpower as a resource that they pooled with American materiel.
During WWII, the Americans had by far the most material resources. The US homeland was not actually attacked (unlike the USSR or GB) and it was and is a huge territory with lots of natural resources. Because of these things, the US was easily able to pretty much give away war material to the other Allies. This seems to me like a way of pooling resources.
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