Multiple Choice Question
Use the graph to answer the question.
What was the MOST LIKELY explanation for the rapid population growth in Pittsburgh from 1860 to 1940?
A.
Pittsburgh became the center of the steel industry in the United States.
B.
Pittsburgh became the most productive gold mining area in the country.
C.
Pittsburgh became the agricultural center of the eastern United States.
D.
Pittsburgh became the country's leader in telegraph and radio production.