Question

what effect did the transcontinental railroad have on the united states?

• it prevented mexico from reclaiming its lost lands from the mexican - american war
• it allowed former confederates to travel north for the first time, learning how to live without slaves
• it spread the products of industrialization throughout the country
• all of these

Explanation:

The transcontinental railroad's key impacts included enabling national distribution of industrial goods, and its post-Civil War timeline meant it did not affect Mexican land reclamation (which was settled by earlier treaties) nor was it a factor for Confederates' post-war relocation. The only valid listed effect is the spread of industrial products across the U.S.

Answer:

It spread the products of industrialization throughout the country