Question

Why was electricity an important factor in the American economic boom of the 1920s?

Answer 1

Electrification, having slowed during the war, progressed greatly as more of the U.S. and Canada was added to the electric grid. Most industries switched from coal power to electricity. At the same time, new power plants were constructed. In America, electricity production almost quadrupled

http://en.wikipedia.org/wiki/Roaring_Twenties#New_infrastructure