Euro cities are generally far older and therefore built to be more accessible without autos.
And both spouses work in most modern families - since our cities have largely grown with the invention of the automobile, it's highly unlikely most families could choose to live in an area that met all their needs while also being easily accessible for both jobs.
I just like to point out that comparing relatively modern US metro areas to long-established European cities is often comparing apples to oranges. Whether we're talking railways or autos, our cities were fundamentally designed quite differently due to when they were laid out and how that influenced their societal growth.
"It’s estimated that about 50 percent of car trips in urban areas are three miles or less in length, making them a possible candidate for replacement with other modes."
Research from Carnegie Mellon University shows how replacing short car trips with bike and scooter trips can lead to less congestion, but local areas need more micromobility infrastructure for this positive outcome.
www.govtech.com
If you look at our population density vs. Europe, it's not really different. Most of our people live on the coasts and in a few cities in between. I know this is an Alabama site, but still most people live in the cities and near towns.
What is different is our political will to design our cities for people instead of cars, and our will to make trips on something besides cars. The Netherlands were overrun with cars in cities in the 1970s, and they decided as a country to redesign their cities for people walking and biking. Sure, their cities were old, but they had already redesigned their cities for cars.
I live in a two worker/multi generation household, and we moved into a house so my wife could walk to work. I commute to work, once a month (I know I'm lucky there, but it's a looong way away). I chose my job that could be mostly remote, again I'm lucky there.
In the past, used to ride between 10 and 21 miles each way to work on my bike, even when I had a spouse and kid. My spouse also rode a regional bus 40 minutes to another city, but she could work on the bus and it was productive time.
I hear over and over, "we are different" or "we have different cities" or "we don't have public transit", but these are all excuses for our lack of political will and personal effort to travel in something besides cars. I get it. Sometimes the weather is bad, or I'm tired, or I need to get somewhere quickly, or I don't want to get sweaty, or I'm going somewhere with the family, so we take the car.
Nobody is arguing for no cars, or everyone has to ride their bike everyday, all of the time. But having a safe and conflict free area to use some other kind of transportation would be transformative for the USA. Excusing "the greatest nation on Earth" from having more than one type of functioning transportation system seems backwards to me.