Final answer:
James J. Hill was called 'The Empire Builder' because of his influential role in expanding the Great Northern Railway and driving economic development across the American West.
Explanation:
James J. Hill earned the title of The Empire Builder due to his significant role in expanding the Great Northern Railway across the northern United States. Hill's vision and determination in constructing railways played a crucial role in the development of the American West, connecting remote regions and fueling economic growth.
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