USA HISTORY

Detailed explanation-1: -The second industrial revolution occurred in the late 19th century with the introduction of linear assembly-lines that could be powered with electrical energy from oil and gas-allowing for huge efficiency gains that would enable mass production.

Detailed explanation-2: -Major Technological Advances of the Second Industrial Revolution. 1870s. Automatic signals, air brakes, and knuckle couplers on the railroads; the Bessemer and then the open-hearth process in the steel mills; the telephone, electric light, and typewriter.

Detailed explanation-3: -In the second revolution, steel, chemicals, electricity, and petroleum led the way to new industrial frontiers. The first major change in industrial development after 1870 was the substitution of steel for iron.

Detailed explanation-4: -Advancements in manufacturing and production technology enabled the widespread adoption of technological systems such as telegraph and railroad networks, gas and water supply, and sewage systems, which had earlier been concentrated to a few select cities.

Detailed explanation-5: -What led to new industrial frontiers in the second revolution? Steel, chemicals, electricity, and petroleum led the way to new industrial frontiers.