about how the kids in America drive the Music industry because of American obsession with Music. Many bands won't even except they made it till they made it to America.
The second meaning is that when she started becoming big in America or possibly touring it she felt like she was a "Kid" to this new land.
Either way I find a catchy song. And even though it is full blown Pop I find there is actual thought put into it than just some Brittany Spears factory produced songs.