Question

How did the transcontinental railroad affect US commerce?

Answer 1

the transcontinental railroad greatly affected the US commerce in sense that it made the transportation of  goods far easier and cheaper which reduced prices

Answer 2

The Transcontinental Railroad was a railroad line through the United States that united the city of Omaha, Nebraska, with Sacramento in the 1860s, thus uniting the Eastern rail network of the United States with California, on the Pacific coast.

It ended with the famous Golden Spike ceremony held on May 10, 1869 in Promontory, Utah, creating a nationwide mechanized transportation network that revolutionized the population and economy of the American West.

This railroad was considered the greatest American technological achievement of the 19th century. It served as a vital link for industry, commerce and travel, uniting the East and West halves of the United States, and creating new settlements in the West.