What impact did railroads have on cities across the united states at the turn of the 20th century?
many cities became industrial centers.
many cities saw a decrease in population.
many cities became agricultural centers.
the railroads had little impact on us cities.

A. Many cities became industrial centers.

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.