Isn't there another popular US song called "My Country 'Tis of Thee" that is just different lyrics set to "God Save the Queen"? A bit funny to have a patriotic song based off the anthem of your former ruler, I think.
Also "God Save our Native Land". Nothing really funny about it, since many aspects of American government come from the mother country.

When I teach the American Rebellion...oops, Revolution in my history classes, I always mention what the regimental history of the Black Watch says about it:

We can boast no Battle Honours for our part
in the American War of Independance,
because it was rightly decreed that Battle Honours
should not be granted for a war with our kith and kin.

T.