Answer:
The railroad opened new markets for trade, and spurred the creation of time zones
Step-by-step explanation:
The rail road made it easier and cheaper to travel accross the country, this made possible for products that prior to this time were too far away could be transported and sold in other parts of the country, opening new markets, and it made the necessity for time zones, because the country is too wide and needs to have different time zones for different coasts and locations.