Final answer:
The growth of the American economy was facilitated by inventions in transportation (railroads), communication (telegraph), and industrial growth technology (assembly line and electric motor).
Step-by-step explanation:
In the late 19th and early 20th centuries, several inventions in transportation, communication, and industrial growth technology played a vital role in the growth of the American economy.
One significant invention was the railroad network, which allowed for faster and more efficient transportation of goods and people across the country. This led to increased trade and economic growth.
Another important invention was the telegraph, which revolutionized communication. The telegraph enabled people to send messages over long distances in a matter of minutes, greatly improving communication in business and government.
Lastly, the development of new technologies in the industrial sector, such as the assembly line and the electric motor, led to increased productivity and efficiency in manufacturing. This allowed for the mass production of goods and contributed to economic growth.
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