During the 1920s, products that grew dramatically in use in the United States included
synthetic fibers.
plastics.
home appliances.
electronics.
All these answers are correct.
During the 1920s, airplanes
experienced a great increase in commercial travel.
had no practical use.
were used almost exclusively for military purposes.
saw the development of the first experimental jet engines.
were largely a source of entertainment.
In the 1920s, the development of practical radio communication was furthered by
the theory of modulation.
the use of vacuum tubes.
its ability to receive more than just simple pulses.
both the theory of modulation and the use of vacuum tubes.
All these answers are correct.
Throughout the 1920s, the performance of the U.S. economy
saw ten straight years of continuous growth.
struggled with a persistently high rate of inflation.
saw per capita income flatten while manufacturing output soared.
saw nearly uninterrupted prosperity coupled with severe inequalities.
experienced a severe recession in 1923 that lasted two years.
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