WORLD HISTORY

Detailed explanation-1: -Once their infrastructure was completed and initial problems resolved, the railways lowered the cost of transporting many kinds of goods. Railroads became a major industry, stimulating other heavy industries such as iron and steel production.

Detailed explanation-2: -In effect, railroads induced increased manufacturing activity in places that were previously held back by expensive modes of transportation. Many of these new places-whether from the existence of untapped natural endowments, commodities, or labor supply-proved particularly efficient at production.

Detailed explanation-3: -Surging Interstate Trade Just as it opened the markets of the west coast and Asia to the east, it brought products of eastern industry to the growing populace beyond the Mississippi. The railroad ensured a production boom, as industry mined the vast resources of the middle and western continent for use in production.