The Second Industrial Revolution, spanning roughly 1870 to 1914, centered on steel, electricity, chemicals, petroleum, and communications. Where the first Industrial Revolution ran on coal, iron, and textile mills, this second wave introduced entirely new sources of power and materials that reshaped manufacturing, transportation, and daily life across Europe and North America.
Steel and Heavy Industry
Steel was the backbone of the Second Industrial Revolution. Earlier methods of producing steel were expensive and limited in scale, but two breakthroughs changed that. The Bessemer process, developed in the 1850s, allowed steel to be made quickly and cheaply by blowing air through molten iron. Then the open-hearth process, first used by Pierre and Émile Martin in France in 1864, offered a slower but more refined approach. Open-hearth furnaces could handle up to 600 tons per batch, and the steel they produced was less brittle and higher quality than Bessemer steel. By the early 1900s, the open-hearth method had become the dominant steelmaking technique.
The flood of affordable steel transformed construction and infrastructure. Railroads replaced iron rails with stronger steel ones. Engineers built the first skyscrapers. Bridges, ships, and heavy machinery all benefited from a material that was both stronger and cheaper than anything previously available. Steel production created massive industrial complexes and employed hundreds of thousands of workers, making it one of the defining industries of the era.
Electricity and Electrical Power
Electricity moved from a scientific curiosity to the dominant power source for factories, streets, and homes in just a few decades. The first commercial uses beyond telegraphy were arc lights, which illuminated large spaces like rail stations, warehouses, and city streets. Then came the incandescent light bulb, developed independently by Joseph Swan in Britain in 1878 and Thomas Edison in the United States in 1879, which made electric lighting practical for homes and offices.
Generating that electricity required its own innovations. Steam turbines, particularly those developed by C.A. Parsons in Britain, powered electrical plants. The world’s first hydroelectric plant opened in Appleton, Wisconsin, in 1882. Italy built a geothermal power plant in 1911. By the turn of the century, electricity had replaced steam as the primary force running factory machinery, and an entirely new industry had emerged with two distinct sectors: companies manufacturing electrical equipment and utilities delivering power to customers. This shift didn’t just change how factories operated. It reorganized entire cities around electrical grids.
Chemicals and Synthetic Materials
The chemical industry grew from a niche into a powerhouse during this period, driven largely by German innovation. One of the most commercially significant breakthroughs was synthetic dye production. For centuries, dyes came from plants, insects, and minerals. German factories began producing synthetic coal-tar dyes in the late nineteenth century, threatening that entire natural supply chain. When the chemical giant BASF introduced synthetic indigo in 1897, the product was so new that even other German manufacturers doubted it was truly artificial, suspecting it was just refined plant-based indigo.
BASF navigated public skepticism carefully, avoiding words like “artificial” in their marketing and instead using phrases like “real colors” and “pure indigo.” Beyond dyes, the chemical industry expanded into fertilizers, explosives, pharmaceuticals, and industrial solvents. These products fed growing populations, armed expanding militaries, and supplied raw materials to other industries. Germany’s dominance in chemical manufacturing became a significant source of economic and military power heading into the twentieth century.
Petroleum and the Internal Combustion Engine
Oil went from a lamp fuel to the energy source of the future during this period, thanks to the internal combustion engine. Karl Benz patented the gasoline-fueled automobile in Germany in 1886 and began marketing it in 1888. The car was initially a luxury, but it created enormous demand for refined petroleum products, spawning an industry that would eventually rival steel and electricity in economic importance.
Henry Ford’s moving assembly line, introduced in 1913, showed what mass production could do for this new technology. Ford’s factory combined interchangeable parts, subdivided labor, and chain-driven delivery systems to cut production time from 12 and a half hours per car down to just 93 minutes. Between 1908 and 1927, Ford produced over 15 million Model T cars, and the price dropped from $850 to as low as $260. That kind of manufacturing efficiency became a model for industries far beyond automobiles, and it locked petroleum into the center of the modern economy. Practical pneumatic tires, mass-produced after John Dunlop patented his design in 1888, helped make both bicycles and cars viable for everyday use.
Transportation and Railroads
Railroads had already reshaped the world during the first Industrial Revolution, but the second wave expanded them dramatically. Cheap steel made it possible to lay thousands of miles of stronger, more durable track. Locomotives became faster and more powerful. Rail networks linked cities, ports, and industrial centers across entire continents, moving raw materials to factories and finished goods to markets at a scale that hadn’t been possible before.
Steamships also improved with better steel hulls and more efficient engines, shrinking the time and cost of transatlantic trade. These transportation advances didn’t just move goods. They moved people, fueling waves of migration and urbanization that defined the era.
Communications Networks
The telegraph, telephone, and wireless radio formed a communications revolution that ran parallel to the industrial one. The first successful transatlantic telegraph cable was laid in 1866 (an earlier 1858 attempt failed after just 23 days and 4,359 transmitted words). By the end of the century, telegraph lines connected every continent except Antarctica. In the United States alone, yearly telegraph messages jumped from about 9.2 million in 1870 to over 63 million in 1900.
Alexander Graham Bell patented the telephone in 1876, and it spread rapidly through Europe and North America, transforming business communications. In 1901, Guglielmo Marconi transmitted the first wireless signal across the Atlantic Ocean from Wales to Newfoundland. These technologies didn’t just connect people socially. They allowed businesses to coordinate supply chains, track shipments, and respond to market conditions across vast distances, making large-scale industrial operations far more efficient.
How These Industries Connected
What made the Second Industrial Revolution distinctive wasn’t just the individual industries but how they reinforced each other. Cheap steel made railroads, skyscrapers, and factory equipment possible. Electricity powered the machines that produced steel and chemicals. Petroleum fueled the vehicles that moved goods along steel rails and across oceans. Communications networks coordinated the whole system. Each industry created demand for the others, producing a feedback loop of growth that fundamentally restructured economies in the United States, Britain, Germany, and France. By 1914, the industrial world looked almost nothing like it had in 1870.