Canada, Australia, India and South Africa are identified as substantial contributors to the British Empire's wartime production. Comparing Britain alone with the United States leaves out those resources. The assessment distinguishes the Empire's already developed capacity from American potential that could expand with investment. Some imperial infrastructure had been developed before and during the First World War, then allowed to decline, while still leaving a large industrial base in the Second World War.
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The British Empire's wider industrial contribution
The industrial comparison includes production across the Empire and distinguishes existing capacity from further American expansion.