Look at the map of cities in the United States at the turn of the twentieth century. A map of the United notes showing the industrial centers of the country at the end of the nineteenth century shaded green. Some cities labeled within these green sections are Boston, New York, Pittsburgh, Cleveland, Birmingham, Saint Paul, Saint Louis, Kansas City, Denver, and San Francisco.

What impact did railroads have on cities across the United States at the turn of the twentieth century?
Many cities became industrial centers.
Many cities saw a decrease in population.
Many cities became agriculture centers.
The railroads had minimal impact on cities across the United States.