Industrialization allowed the U.S. to produce huge amounts of many different products. One product became a symbol for industrialization: steel.
Steel is a very strong metal made by heating iron until it melts, then adding other elements. Steel was expensive until the 1850s and 1860s, when inventors discovered ways to make steel much more cheaply and in much larger amounts.
Strong and inexpensive steel made many of the most impressive construction projects of the Gilded Age possible. Match the descriptions of these projects to the images.