You would be correct there are no "banned books" in America.
When people say "banned book" they mean that a certain level of government such as a school board or municipality has "banned" them from being in a public (often school) library.
But the headline "In [state I disagree with] they are banning books that have [ideas I agree with]" makes a lot more headlines and clicks.
Then people run with the phrase "banned books" to make things sound worse than they are.
The point is that those books aren't actually banned for general access. They may not be present in a school library, but you can certainly get them on Amazon.
Relying on the ultra mainstream wikipedia for a banned book would be hilarious if it weren't so deeply disappointing. They'll list nothing interesting.
When people say "banned book" they mean that a certain level of government such as a school board or municipality has "banned" them from being in a public (often school) library.
But the headline "In [state I disagree with] they are banning books that have [ideas I agree with]" makes a lot more headlines and clicks.
Then people run with the phrase "banned books" to make things sound worse than they are.