Question

The population growth in the American west following the Civil War was made possible mainly by

Answer 1

Railroads

Step-by-step explanation:

Because the more railroads that were built, the more industrialized land that began to pop up.

Answer 2

There were two main things. One is a large influx of immigrants, both from Asia and from Europe. The other was railroads that developed rapidly and made it possible to transfer people quickly from one part of the country to the another so people weren't too afraid of going too far west.