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US President Donald Trump's decision to levy steel import tariffs was considered controversial by many people. However, it has prompted a revival in America's steel-making industry. That in turn is having a knock-on impact on the shipping business in the busy port of Duluth, North Minnesota. The BBC's Fergus Nicoll reports from the shores of Lake Superior, where the region's iron ore travels from the mines to Canada and beyond through the Great Lakes network across America and out to the ocean. (Image: Duluth lift bridge Credit: Getty Images)
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