SAT Subject US History Practice Question 43: Answer and Explanation

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Question: 43

1. All these inventions helped revolutionize the U.S. economy in the early nineteenth century EXCEPT:

A. the cotton gin
B. the locomotive
C. the incandescent lightbulb
D. the steamboat
E. the spinning jenny

Correct Answer: C


Thomas Edison did not invent the incandescent lightbulb in 1879 but he created the first practical lightbulb and the electrical system to support it. All the other inventions date from this period and had a profound effect on the U.S. economy.

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