4 factors that contributed to the rapid industrialization in the US in the late 1800s. (Please help)

Five factors that spurred industrial growth in the late 1800's are Abundant natural resources (coal, iron, oil); Abundant labor supply; Railroads; Labor saving technological advances (new patents) and Pro-Business government policies.

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 believe the answer would be 1.

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