It’s incredible to see how quickly things changed ~1910-1930 in terms of infrastructure and technology. You’re going from horses and cobblestone to almost modern cars and pavement, within just 20 years or so.
I would say that change happened much earlier, and was almost complete by 1911 in many US cities. OTOH I had a hard time telling apart cars from 1910s vs 1930s. Around the early/mid 30s a much more modern style of car came on the scene (Ford Phaeton etc. I guess), but I suppose it took a while before the Model-T style vehicles were all replaced.
Same thing with smartphones. If the photos is of a crowd, it is immediately obvious if it is after 2012 by the fact that everybody is watching their hands.