SAT Subject US History Practice Question 554: Answer and Explanation
85. Which of the following machines, invented in 1793, was primarily responsible for an economic boom in the South?
A. Eli Whitney's cotton gin
B. Robert Fulton's steam engine
C. Henry Bessemer's steel converter
D. John Deere's tractor
E. Edwin L. Drake's oil drill
Correct Answer: A
The cotton gin could process more cotton than hundreds of slaves could process by hand in the same amount of time.