That is to say, there's enough there to suggest that this wasn't the free market answering solely to consumer demand.
If you follow the same 100 year trajectory in other countries, then you will see an uptick in car ownership for sure, and infrastructure adapts to support this (highways/freeways/motorways), but it's not nearly as drastic as it is stateside.
Of course, the US is a large place and even its states are larger than other countries. And it hasn't existed in its modern form for more than a couple of centuries whereas the civil infra on the other continents has been around for at least a full millennium and most likely longer than that (e.g. Roman roads in the UK that would date back well over 1000 years). So the US got the luxury of a blank slate and, well... see what you got from that.
At the same time...car manufacturers had the perfect opportunity to seize so they could sell more cars and thus have civil infrastructure designed around the fact that everyone has a car. If someone at that point in time had more money than Henry Ford they could have dumped it into trams and trains and the landscape would have been significantly changed.
As the Wikipedia article you cited elsewhere discusses, streetcar systems outside the US went out of business at the same time as those in the US for the same reasons.
[1] No, kids, Who Framed Roger Rabbit? isn't real history
When there's funding for highways but not rails, the results are unsurprising. The benefits of public transit are a positive externality[1][2].
[1]https://en.wikipedia.org/wiki/Externality#Positive
[2]Real history is way worse
Because it was basically 100 years ago when the car industry sought to dismantle that infrastructure, and succeeded.