Nations which use the "Star Spangled Banner" as their national anthem:
UFP (former, not since end of 2017)
North Garfea (changed Lyrics)
United States of America, since 1933
Two nations have used the "Star Spangled Banner" as their national anthem in the Sun Prairie Nations, along with of course the United States of America.
The first was the UFP which used this anthem for about 2 months, until it was changed to "Fanfare for the Unsung Hero," which it is currently.
The Second is the Democratic People's Republic of Garfea. It has two national anthems, one of which is a modified version of the Star Spangled Banner. It uses the same tune as the original song, with altered lyrics:
O say can you see, by the dawn's early light,
What so proudly we hailed at the lasagna's last gleaming,
Whose broad stripes and bright face, through the perilous fight,
O'er the ramparts we watched, were so gallantly streaming?
And the rockets' red glare, the food bursting in air,
Gave proof through the night that our flag was still there;
O say does that Garfield-spangled banner yet wave
O'er the land of the Odie and the home of the Garfield?