a 10 mile commute is not across the USA

Because you don’t cross a continent by bike or car, you do it by fast or night train in which you can take your bicycle.

Or by plane if you’re in a hurry.

Was this all an attempt to "gotcha" people to prove that cars on free roads go faster and protect you better from elements than bikes? I mean, yeah of course they do. This doesn't make them "superior" in an absolute way because superiority depends on parameters. Take cost, health benefits, maintenance costs, environmental impact and bikes would be superior.

Can't talk about US, but in Italy the daily average by car was between 10 and 15 kilometers I seem to remember, that is 30-40min by bike at a slow pace. For that I would 100% say that provided infrastructure exists, bikes are a largely superior transportation vehicle compared to everything else. If you talk about traveling between islands I would say a boat is more efficient, or if you have to travel 500km I would say planes are. Superiority depends on the specific evaluation, that's my point. For the kind of coast to coast trip you mentioned, in winter, I would say trains can be vastly superior to cars, for example, and they can be combined with bikes.

50% of the Boston workforce commutes by train every day, and that's with how notoriously bad the Boston T is considered. 100 years ago, before the advent of car centric urban design, the Boston T was twice the size it is today, servicing towns all over eastern Massachusetts. A big part of the reason that a car is your best option for pretty much anything is because our country was redesigned to make it necessary. We used to have streetcar towns here - trolley systems that ran up and down the major hubs in towns - that they straight up paved over the rails for, making things less accessible in the name of selling cars and gasoline. They're also a major contributing factor in the death of small businesses and the rise of the giant box stores at the edge of town that you have to drive 20 minutes to in order to go food shopping.

Your argument is in bad faith, and your reasoning is disingenuous. Pretty much every large town west of the Mississippi grew around a train station. Nobody is taking away your freedom to sit in traffic on your morning commute. But imagine how much better that commute would be if you could take 50 cars off the road per bus or hundreds per light rail train. The average commuter car in the US has 1.2 people in it. If you make it so that drivers don't have to deal with walkers and bikers, and vice versa, everybody wins.

Took me 40 min each direction (best time was 30 min), car took 20-30 min (very little traffic) and the bus took 40+ min. But I could also skip the gym since I already got my exercise for the day, so I consider it a wash. With an ebike, I could cut that almost in half (legal top speed is 28mph, but nobody enforces that, so I could probably go 30-35mph). I average about 15-20 mph, depending on wind.

10 miles is really far for a bike commute though. If you live somewhere bike centric, you'd probably only go 3-5 miles, at which point the time difference is negligible and probably faster by bike because of no parking issues.

And the bus was only necessary because we don't plow bike lanes. With proper infrastructure, I wouldn't need the bus at all. My coldest commute was ~5F, and layers kept the ride completely comfortable, so the issue was literally only the lack of infrastructure.

My point isn't to say the US is currently completely bikeable, my point is that with proper infra, it could be. We don't have as nasty of weather as the NE and MW, but we do get low temps and snow, and I've seen madlads cycling in the MW in crazy weather.