Thomas Pynchon's Against the Day is an interesting read on this and explores the rapid changes in a far more human way than anything else I have read on the period. He renders it as the period when technology and knowledge ceased being things of the select few and become a large enough part of the average person's life, and this being what caused the real change; knowledge fundamentally changed society's relationship with the unknown and technology played a shell game with what is inconvenient. His treatment of photography and the development of film is really interesting and does an amazing job of showing what we lost as well as what we gained.