Use the map of the United States in 1870 to answer the following question. In the 1840 's iron ore was discovered in Michigan and Minnesota. However, the largest steel works were in Pennsylvania. How did steel makers resolve this problem by the 1870s and 1880s?
A. They built steelworks near the iron ore deposits in Michigan and Minnesota
8. They used the growing railway system to transport the ore to Ponnsylvania.
c. They lobbied the government to construct new canals on which to transport the iron ore.
D. They developed new alloys that used a lower percentage of iron than traditional steel.