Andrew Carnegie started working for Tom Scott, who would later become his mentor, when he was twelve years old. He was manager of the company by twenty-four years old. As westward expansion became popular, Scott planned to build a bridge across the Mississippi River, this had never been done before. Carnegie was unsure of how to build something so large, especially when steel was made in slow amounts of time, but then discovered a new, efficient way to make steel. The bridge was built in four years…
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