Look at the map. A map of the United notes with some cities highlighted green. 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.

Many cities became industrial centers.

Explanation:

The railroads stimulated the transport not only of products, but also of machinery and equipment at a speed never seen before. This encouraged some cities to invest in industrial production, as this was a profitable industry and would stimulate the local economy. This made many cities to become large industrial centers, have a strong economy and build the basis for the industry we know today.

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.