The answer depends on which technological revolution you mean, because there have been several, each building on the last. The most commonly referenced “technological revolution” is the Second Industrial Revolution, which most historians date to around 1870. But the broader story stretches from the late 1700s through the digital age that began in the mid-20th century.
The First Industrial Revolution: Late 1700s
The traditional starting point for industrial technology is the late 18th century in Britain, when steam engines and mechanized textile production transformed manufacturing. But recent research from the University of Cambridge paints a more complicated picture. Britain was already shifting toward an industrial economy under the Stuart monarchs in the 1600s, over a century before the mills and steam engines that textbooks credit as the birth of global industry.
The numbers are striking. The share of male agricultural workers in Britain fell from 64% to 42% between 1600 and 1740. Over the same period, the share of men involved in producing goods rose from 28% to 42%. In Lancashire, the share of men in manufacturing grew from 42% in 1660 to 61% by 1750, driven by a doubling of textile workers. Norfolk was likely the most industrialized county by 1700, with 63% of adult men working in industry. These early industries looked like “factories without machines spread out over hundreds of households,” producing goods for international markets long before anyone built a power loom.
Still, the late 1700s remain the conventional marker because that’s when machines powered by water and steam began replacing human and animal labor at scale. The key difference between this era and everything before it was methodology: controlled experiments guided by science replaced the experience-based trial and error that had driven innovation for millennia. Before the Industrial Revolution, it was peasants and craftsmen, not scientists, who drove technological progress. The Scientific Revolution of the 15th and 16th centuries laid the groundwork by introducing systematic experimentation as a tool for discovery.
The Second Industrial Revolution: 1870 to 1914
When people search for “the technological revolution,” this is often what they’re looking for. The period from 1870 to 1914 is when technology began reshaping everyday life in ways the average person could feel: electric lights, telephones, affordable steel, internal combustion engines, and industrial chemicals. Some of its characteristic developments appeared as early as the 1850s, but the core period runs from 1870 to the start of World War I.
What set this revolution apart from the first was the relationship between science and technology. The first Industrial Revolution had little scientific foundation. Inventors tinkered and improved machines through hands-on experience. The second revolution flipped that model. Formal scientific knowledge began feeding directly into technological development, and technological problems pushed scientists toward new discoveries. That feedback loop accelerated innovation across a far broader range of industries than the first revolution ever touched.
Steel, Electricity, and Engines
A handful of breakthroughs defined the era. In 1856, Henry Bessemer patented the first method for mass-producing steel. The flood of low-cost steel that followed revolutionized building construction and replaced iron in railroad rails and countless other applications. Steel was the skeleton of the modern industrial world.
Electricity moved from laboratory curiosity to practical infrastructure remarkably fast. On September 4, 1882, Thomas Edison’s Pearl Street Station in lower Manhattan became the world’s first permanent central electric power station, delivering power to customers in its surrounding district. Within a generation, electrical networks were transforming cities, factories, and homes.
In 1876, Nikolaus Otto built the first successful four-stroke internal combustion engine, now known as the Otto cycle. It was reliable, efficient, and quieter than steam alternatives. More than 30,000 Otto cycle engines were built in the following decade, setting the stage for the automobile and powered flight.
Communications and Systems
The revolution also rewired how information traveled. The first transatlantic telegraph cable carried its inaugural message on August 16, 1858: “Europe and America are united by telegraphic communication.” Rudimentary networks for telegraph, gas, water, and sewage already existed before 1870, but they expanded enormously in the decades that followed. Electrical power grids and telephone networks were the most transformative additions, creating interconnected technological systems that defined modern urban life.
The organization of production changed just as dramatically as the technology itself. Huge economies of scale emerged in certain industries, and the concept of “throughput,” moving raw materials through a production process as efficiently as possible, became central to industrial strategy. This was the era that gave rise to the modern corporation.
The Digital Revolution: Mid-20th Century
The technological revolution most relevant to modern life began taking shape in the 1940s. In 1937, John Atanasoff and Clifford Berry developed the Atanasoff-Berry Computer, a prototype electronic machine that used binary digits (bits) to represent data. This was the conceptual seed of every computer that followed. A decade later, in 1947, the transistor was invented, replacing bulky vacuum tubes and making electronics smaller, cheaper, and more reliable.
The transistor is arguably the single most important invention of the 20th century. It made possible everything from portable radios in the 1950s to smartphones today. The commercialization of mobile phones followed in 1979, and the internet’s expansion in the 1990s connected billions of people to a global information network. Each step built on the digital foundation laid in the 1930s and 1940s.
The Fourth Industrial Revolution: 2010s
The most recent chapter is sometimes called Industry 4.0, a term that originated in Germany. In October 2012, a working group presented strategic recommendations for integrating internet-connected systems into manufacturing at a forum in Berlin. By April 2013, the group delivered concrete recommendations to Chancellor Angela Merkel at the Hannover Messe, Germany’s flagship industrial trade fair. The core idea: merging physical production with the Internet of Things, artificial intelligence, and networked data systems.
Industry 4.0 is less a sharp break than an acceleration of the digital revolution. Smart factories, autonomous vehicles, and AI-driven decision-making all grow from transistors and binary code. But the scale and speed of change, where software can redesign physical systems in real time, represents something qualitatively different from earlier digital technology.
Why There’s No Single Start Date
Each technological revolution grew from the one before it. Cheap steel from the 1850s enabled the electrical grids of the 1880s. Electrical infrastructure made possible the electronics labs that produced transistors in the 1940s. Transistors enabled the computers that now run smart factories. The most common answer to “when did the technological revolution start” is 1870, because that’s when science-driven technology began transforming daily life at a pace people could actually perceive. But the honest answer is that it depends on which wave of change you’re asking about, and none of them had a clean beginning.