Entering the 20th Century

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Electric home appliances allowed Americans to--

Who used the assembly line concept to build cars?

As a result of the development of radio, the broadcast industry, and telephones, the life of Americans changed through—

The reduced price of cars improved transportation and American life. Which of the following did NOT happen because of this improvement?

During the early twentieth century people gained greater mobility which led to –

All of the following were communication changes in the early 20th century EXCEPT—

Where was the first flight of an airplane?

All of the following are labor-saving products EXCEPT-