In 1893 the "Seven Iron Brothers" had claims on a significant portion of the Mesabi Range and had built the Duluth, Missabe, and Northern Railway, but due to financial issues, they were forced to sell their shares to John D. Rockefeller, which later made the Mesabi Range and the nearby Vermilion Range to make Minnesota the nation's largest producer of iron ore and the United States.
In 1893 the "Seven Iron Brothers" had claims on a significant portion of the Mesabi Range and had built the Duluth, Missabe, and Northern Railway, but due to financial issues, they were forced to sell their shares to John D. Rockefeller, which later made the Mesabi Range and the nearby Vermilion Range to make Minnesota the nation's largest producer of iron ore and the United States.