Final answer:
The transcontinental railroad shaped American lives through industrial expansion, urbanization, and economic growth.
Explanation:
The transcontinental railroad played a crucial role in transforming the lives of American citizens during the 19th century. It fueled industrial expansion, urbanization, and economic growth, leading to the decline of craft industries and small shops as people moved to work in factories. Additionally, railroads revolutionized transportation and communication, connecting the nation and enabling the emergence of a national market system.
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