Railroads became a major industry, stimulating other heavy industries such as iron and steel production. These advances in travel and transport helped drive settlement in the western regions of North America and were integral to the nation's industrialization.

Improved transportation fundamentally transformed the United States during the 19th and 20th centuries by driving economic integration, westward expansion, and social change. The "Transportation Revolution"—marked by the development of canals, steamboats, and railroads—dramatically slashed shipping costs and travel times. For instance, the Erie Canal reduced the cost of moving freight from $0.30 to $0.02 per ton-mile, while the Transcontinental Railroad shortened a cross-country journey from six months to just ten days. These innovations facilitated the rise of industrialization by connecting raw materials with factories and agricultural products with urban markets, effectively creating a unified national economy. Socially, it enabled mass migration and urbanization, as well as the spread of ideas and news, contributing to a cohesive national identity. However, it also had significant negative impacts, including the displacement of Native American populations and the exacerbation of regional tensions regarding the expansion of labor systems that ultimately contributed to the Civil War.