Like someone said earlier:
Miley is talking about being nervous entering LA - which is a whole different place than Tenessee (Her Home-State).
When she hears the 'Britney' song or the 'Jay-Z' song, she realizes that she's in the same world - the same country even - and is reassured.
She describes her relief as "A Party in the USA"
(: Hope that helped!
Like someone said earlier: Miley is talking about being nervous entering LA - which is a whole different place than Tenessee (Her Home-State). When she hears the 'Britney' song or the 'Jay-Z' song, she realizes that she's in the same world - the same country even - and is reassured. She describes her relief as "A Party in the USA" (: Hope that helped!