Which application of a new technology can be attributed to an invention of Thomas Edison? a
Sonar technology was used to track submarines.
b
Refrigerated railroad cars allowed food to be transported long distances.
c
Light bulbs made it efficient for factory workers to work at night.
d
Diesel engines were used in the production of airplanes.
Question 9 (5 points)
The Knights of Labor and the America Federation of Labor developed in response to the-
a
increased demand for skilled workers
b
decreased power of political machines
c
decreased profitability of the agricultural sector
d
increased need to protect worker interests