Final answer:
The expansion of railroad networks in the late 19th century allowed companies to sell their products in more markets, led to competition among small railroad companies, and contributed to the growth of towns and cities along the rail lines.
Step-by-step explanation:
The expansion of railroad networks in the late 19th century had a significant impact on the U.S. economy as a whole. One major effect was that it allowed companies to sell their products in more markets. With the ability to transport goods more quickly and efficiently, businesses could reach a wider customer base and increase their sales.
Another consequence of the railroad expansion was the creation of competition among many small railroad companies. As more and more railroads were built, different companies vied for customers and routes, leading to price competition and innovation in the industry.
The expansion also led to the growth of towns and cities along the rail lines. New communities sprang up as people sought opportunities near the railroad, leading to population growth and economic development in various regions of the country.
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