I never knew Boston was designed for cars (yes, that’s sarcasm, Boston is known for its roads being enlarged footpaths dating back hundreds of years, some of which started as paths that animals took).

The US is much more complex than such a simple statement. US cities, historically, weren’t so much designed as grew. And I still see that today. My town, a suburb of a city, was established about 1860 (140 years ago), when there was empty space between it and the city - farmland.

It certainly wasn’t “designed for cars” that didn’t exist at the time. The town I grew up in existed before cars.

And I’ve seen this all over the place. The cities grow until they run into small towns, which then become suburbs of the city. These small towns were often agriculture based (or manufacturing based), because farms need to take their cop to the train, the train stop ends up growing a town.

The only “designed” city I can think of is one in Maryland. There are others, but cities aren’t “designed” - that implies an over-arching plan. Cities are organic, they grow.

If you want to make a “design” argument, Western Europe is much more in line with this idea, since so much infrastructure was destroyed by two successive world wars over 20 years, and the reconstruction with “modern” engineering and design that took place starting in the 1950’s.