Which invention during the 19th and early 20th century do you think had the greatest impact on the daily life of americans? why?

Where would we be without electricity—or the light bulb? Probably sitting in the soft glow of our kerosene lantern wondering why the toaster isn’t working. Clearly, the advent of electricity in the waning years of the nineteenth century had an enormous impact on society, for it not only reduced the fire danger by replacing gas-fed street lamps with non flammable electric light bulbs, but paved the way for everything from the television and the radio to the refrigerator and the curling iron. Of course, it also brought us the electric chair, but that’s another story.