9. Which of these was NOT a technological invention before the American Civil War?
A. The telegraph
C. The telephone
B. Railroads-Steam Engines
D. the Erie Canal

C) The Telephone

Explanation:

The first phone call ever made was on March 10, 1876. This was more than a decade after the Civil War ended.

Meanwhile, the telegraph was heavily used throughout the Civil War, as well as Railroads and steam engines. The Erie Canal was completed in 1825, which was well before the Civil War started (April 12, 1861). This allows us to rule out choices A, B and D.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.