In the post-WW2 era up to the 70's. The 70's are when there was a big movement that initiated the social change back to being more walk/bike-friendly (though it took decades to get Dutch cities to where they are now): https://en.wikibooks.org/wiki/Transportation_Planning_Casebo...

You can find pics of what it was like in their cities. Not exactly the same as US ones necessarily, but close. There's a couple pics here: https://www.distilled.earth/p/how-the-netherlands-built-a-bi...