Final answer:
The technology that MOST aided in the settlement of the West after the Civil War was the railroad.
Step-by-step explanation:
The technology that MOST aided in the settlement of the West during the period immediately following the Civil War was the railroad. The construction of the transcontinental railroads allowed for faster and more efficient transportation of people, goods, and resources across the vast region. It connected the East Coast with the West Coast, facilitating trade, commerce, and the movement of settlers to the West. The railroad also played a crucial role in the development of towns and cities along its route.
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