The sub-division of Industrial into Steam and Combustion is, I think, a little inaccurate: in 1900 only 22% of all the automobiles in the USA were powered by the internal Combustion engine: 40% were by Steam, 38% by Electricity, and it was the advent of cheap and near-universal Electricity that transformed the way everyone did everything. Electrification would be a better 2nd Stage for the Industrial Era.
1. The problem is that there is no universal use electricity in 1900, either, even in the USA.
2. If we look at the general situation, and not just a local automobiles example, then ...
a) The available capacities are negligible compared to steam.
b). In fact, internal combustion engines began to actively spread EARLIER than electric ones. In 1875, there is already a commercially successful Otto ICE, produced by many hundreds per year. At the same time, the limited commercial use of electric motors in industry is the second half of the 1890s.
c) Practical incandescent lamps with tungsten filament are 1907, the Ford conveyor is 1908. Mass electric lighting is almost synchronous with motorization.
3. It seems to me that it is not worth focusing on the time of technology dissemination (including relative, in relation to other technologies), and not on the time of invention of practically successful samples at all.
Firstly, the spread of technologies does not occur within the framework of the logic of the "tree" - scaling costs play a huge role. Relatively speaking, a cinema costs much less than a metallurgical plant or a railway. The result is a bit predictable
Secondly, we get into a dead end of estimating the spread. If we focus on the global situation, then, for example, the vast majority of the world has experienced industrialization with a giant delay. Even industrial metallurgy spread globally closer to the 1960s.
If we limit ourselves to the framework of "North America + Western Europe", then there will still be a gap of decades. So, if we compare the indicators of motorization, telephony, electrification of the USA and Europe in the first decades of the twentieth century, the result will be impressive. If we focus on the most advanced country, then in the 17th century we will get Holland with a population of 3 million as a reference.
However, here the problem is solved by abandoning the rigid chronological framework.
Thirdly, the spread of technology is associated with a bunch of "external" factors – GMOs are not the first and obviously not the last technology here.
Fourth, the focus on distribution contradicts the logic of the game. The player invests in RESEARCH and decides for HIMSELF how widely to apply the technology.
4. If we return to the problem of the "main technology" of the second half of the 19th - early twentieth century, then it is easiest to focus on the the "official" version
The invention of the converter is officially considered the start of the "second industrial revolution". In 1856. As a result of the development of innovation, steel production increased twenty-fold between 1870 and 1900. And that, in general, shaped the world as we know it. Starting with the really massive spread of steam engines and really large-scale railway construction.
That is, simply inventing a steam engine and a steam locomotive is far from enough for a radical change in the economic model. 50 years after Watt's invention (1826), the total power of steam engines in England reached only 80 thousand horsepower. Railways in England were built at an average rate of 550 km per year. In general, as economists of the 1980s noticed, early steam produced a lot of smoke, but little large-scale impact on statistics.
At the same time, if the fact of the commercial use of steam is important, then you need to start not with Watt, but with Severi (1698). In general, we can single out about a 160-year period when steam is already being used, but in general the Renaissance energy still dominates, while there are large-scale shifts in the economy, but they are mainly associated with the revolution in light industry, the agrarian revolution, etc.
And then Bessemer came..
At the same time, right next to it, for example, the invention of the technology for producing paper from wood (1859), the first kerosene plant, the first plastic (1855), etc. Meanwhile, thanks to "wooden" paper, the cost of cheap books and newspapers in the second half of the 19th century fell fourfold. As an obvious result, education has become cheaper, the circulation of the same British press has quickly grown to tens of thousands. I don't think it's worth explaining how this affected the mass consciousness either.
Then, within a short period of time, a practical dynamo and an internal combustion engine were invented. The fourth system–forming innovation (conveyor in line production) is 1882.