In what areas were major industrial breakthroughs made in the Second Industrial Revolution?

This period of industrialization began from the late 1800s to the early 1900s. During this period, telegraph and railroads spread across the country. This led to greater movement of people and began new trend in globalization. Electricity gave rise to the need for oil and gas. Sewage systems were now also being used. The telephone and the automobile greatly improved communication and transportation.