What factors to promote american's huge industrial growth during the period from 1860- 1900

Several factors led to the rise of U.S. industrialization in the late 1800’s. New technologies like steam engines, railroads, and telegraphs made communication and transportation easier. The ability to source and transport materials across the country with ease turned many local businesses into national companies. Workplace innovations, such as the assembly-line method of production, allowed these companies to produce goods on a mass scale.

I am not sure...but I think it is the economy(trade basically) which helped them. 

The answer is an appellate court.