Final answer:
The meatpacking industry was most affected by the refrigerated railcar as it enabled them to transport fresh meat over long distances without it spoiling, thereby revolutionizing the industry.
Step-by-step explanation:
The industry that was most impacted by the advent of the refrigerated railcar was the meatpacking industry. Before refrigerated railcars, it was difficult to transport fresh meat over long distances. The refrigerated railcar allowed meat to be kept at low temperatures, which extended its shelf life and enabled it to be shipped across the country without spoiling. This revolutionized the meatpacking industry, expanding markets and allowing for mass production of meat products. Other industries, like textiles, farming, and steel-making, were not as directly affected by this innovation.
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