They’re generous with the applause.
Clapping after a live performance when the artist(s) can see or hear is understandable. But it’s how Americans applaud things like an exciting scene in a movie or when a plane lands safely that confuse many others around the world.
Americans were brought up to show respect for a job well done, whatever that job is. They’re taught to say ‘thank you’ from a young age and the rousing applause is just another way for them to show their appreciation.
And in relation to that…