It's 24% + 10% self employment + (NY? CA?) 9% state tax + Obamacare (often around 5% or more).
And if you have kids, you are paying a lot more stuff that is included as part of the deal in Sweden (and most other European countries).
And when your kids were born, you would have received 12 months paid maternity leave in Sweden (which can be divided among mom and dad).
If we are twenty, have no kids, no medical issues, and on an academic scholarship, the US taxes seem very low. In almost any other situation, they are comparable, even though they look much lower.
And especially at the top bracket, e.g. in NYC you have 39% federal + 13.5% state/local + health care ... which is almost the same 60%, except you get to pay $100K-$200K tuition for yourself or kids, and stuff like that.