I have lived in the US for 9 months, as an exchange student. I was in Buhl, Idaho. Other cities I saw: Seattle (twice), Portland, Salt Lake City, and Vancouver, BC (Canada).
So this is probabily not a good comparison, since not all Europe is like belgium, and I guess all US is not like Idaho (I hope so at least
).
I mostly know High School student life, since I was in High School. And what i know of Europe, for school system, is Belgium.
I think a lot of things are different. The school systems are different, the food we get for lunch at school is different.
I thought that in US school system, you could pass all your high school by taking only easy classes, which is far more difficult to do in Belgium. A school day is also very different (schedule). In Belgium, we have 7 or 8 different subject a day (50 min. from each). Lunch pause was 1hr (only 30 min in Buhl).
Also, youth american can drive at 15 in Idaho. In Belgium and Germany, you must be 18. But the public transports (subay, tramwas ans trains) are well developped, so people dont need a car as much as in the US (In Idaho, with no car, you cant go anywhere!)
Social security is also different, and insurances are cheaper in Belgium.
For job, i think people dont work as much in EU than in US.
Stupid example, stores and shopping malls in Belgium close at 6:30 pm ans sometimes 7:00 pm and supermarket close between 6:30 and 8:00 pm. And they open at 9:00 or 9:30. I saw a supermarket opened at 7:30 am one time in the US. Also, stores closes at 10:00pm in the US.
We have more days off due to feasts in Belgium, and I believe people can have more days off they can choose themselves in Europe.
I dont know if it was something like that you wanted as an answer, but that is what i could think of at the moment.
edit: also, the houses styles, the way the streets are disposed in towns are different.