Andrew Carnegie began working for Tom Scott at the age of 12. Scott liked Carnegie and hired him as a personal assistant. In 1868 Scott asked Carnegie to build a bridge across the Mississippi River, to be the largest bridge to ever be built in America. Carnegie has no idea how to build it so he looks for advice from Keystone bridge builders. He decided to use steel, a relatively new material to the time. It was extremely expensive and hard to mass produce tho, no one have ever tried to use steel to build such a large structure. A English inventor has created a way to reduce the time to produce steel from two weeks to 15 minutes. The bridge is extremely off schedule and the cost was rising very high. When the bridge is finished he continues
