The unique theme of the west coast sinking away seems to be one of the very few uniquely American themes in song. There's a cute throwaway song with the same subject that my brother used to sing in coffee houses:

"Edgar, did you ever, ever, really feel that California s l i d e?"

The only other uniquely American theme I have come up with is:

Brake failure on a steep slow, started in railroad days with "Casey Jones" turning to trucking mishaps in latter days: "Wolf Creek Pass" and "40,000 Pounds of Bananas".