A tech worker in Silicon Valley will easily hit >40% income tax (30+ federal, 10 Cali). Sales tax is up to 10%. Many places have affordable property tax due to American laws on home ownership. California may be a state with laws closer to Europe than many other American states (eg texas). Massachusetts/New England generally have “better” laws too (eg MA has stronger healthcare protections than most states).
Not sure what ordinary Europeans actual pay, but an internet search says German taxes go up to 40s, which seems pretty inline with Cali.
Obviously a tech worker in SV will be top few % for American salaries, but you need to be a well paid urban worker in America to be able to get healthcare and an income that affords college for children and good public transit and other things Europeans get from their governments.