Answer:
American technological progress
Explanation:
Westward expansion brought railroads and the telegraph as well as other advances in communication and transportation.
Westward expansion led to the marked increase in American technological progress.
What is expansion?
The word “expansion” refers to the process of extending or enlarging an existing thing or object. For instance, the extension of laws, statements, and agreements.
The United States' westward expansion gave it sophisticated natural resources and a sizable infrastructure, including the telegraph and railroads, among other improvements in communication and transportation.
As industry started to produce goods and services, westward expansion generated economic activity. The nineteenth century was greatly impacted by it.
Hence, the significance of the expansion is aforementioned.
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