The shift in steel production locations in the United States from the mid-nineteenth century until the mid-twentieth century can best be described as
A) starting in the Midwest and then migrating towards Pittsburgh before ending up on the East and West coast.
B) starting on the East and West coast and then migrating towards Pittsburgh before ending in the Midwest.
C) starting in the Pittsburgh area and then migrating towards the Midwest before ending up on the East and West coast.
D) starting in the Pittsburgh area and then migrating towards the East and West coast before moving overseas.
Answer: C
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