A look at how Hitler calculated that to fight on long enough to fulfil his aim of eradicating Europe's Jews he needed to capture the Caucasus, and to do that he had to take Stalingrad. There is also a look at how the US rebuilt its navy and took itself from the 18th-ranked army in the world to be second only to the Soviet Union, a tale of ingenuity and enterprise that turned the vast resources of America into the numbers that could win a war.

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War