If the U.S. selected a small number of the very tallest people around the world to immigrate to U.S., these people would be taller than most Americans.

The children of these immigrants would tend to be quite tall as well.

In this example it’s hopefully clear that this has nothing to do with TV shows. And that it doesn’t mean that U.S. has a culture that promotes mediocre height.

The same principles are true for talent. The foreign talent is a result of selection from a large pool, not of which TV shows people watch growing up.