To be fair, most young people aren't from the USA, so this tracks.
What I'm really curious about is how many young people are proud to be British. I myself never really felt any pride based on where I happened to be born, it was just a fluke of existence after all. There are great things about my country, but they're balanced out by bad things, which is true of most Western nations. We're alas, pretty imperfect beings.
To be fair, the headline is shitty. It means most American young people. I just didn't want to change the headline because we don't tend to editorialize in this community.