In 1883 is when the US officially had organized “time zones.” This is when people realized this had less to do where you were on earth but more on telegraphic signals. This changed time and space completely. Now electric light is created for work hours to correspond to available light but electric light made work hours the same no matter what season. The biggest technological advance made in the 20th century was considered the telephone. I agree that telephone was the most important created. I believe this because in 2018 no one can even live without a phone. The phone has progressed jobs, families, and everyday life to extremes no one would even imagine in the 20th century. We use telephones to do even the simplest tasks like turn on electric light. Without phones the amount of networking going on today would not be available and force to improve all aspects of life everywhere due to this advancement.