"The Happiest Girl in the Whole USA" is a country and pop music song written, composed, and recorded by Donna Fargo.
It is written in the voice of a newlywed girl, sung to her new husband.
Fargo told Tom Roland in The Billboard Book of Number One Country Hits that she wrote the song with a different title originally.
"It really started out to be 'Happiest Girl in the World,' but the rhyme scheme got to be too unnatural, so I changed it to 'U.S.A.'
Fargo has since put the rumor to rest, stating that "skip-a-dee-doo-dah" was indeed the original line and that no such lawsuit ever took place.