No significance can be attached to 'wild goose nation.'
It also appears in sea chanteys, esp. "We'll Ranzo Way." Hugill commented-
"Most versions (the chantey) refer to the "Wild Goose Nation." This mysterious race of people often crops up in shantydom and also in nigger minstreldom, and many theories have been put forward regarding the origin, none, I'm afraid, very convincing. Doerflinger maintains that in minstreldom the phrase refers to Southern or Indian-inhabited country. Miss Colcord rather fancies Ireland as the source, since she has discovered that the phrase 'Wild Goose Nation' was used as a poetical name for the Irish, in particular for the Irish Guards who fought for the French in the wars of 1748."
See Kipling's poem, "The Irish Guards."
In history, Irish who refused to fight for the British crown or deserted to opposing forces, went into exile, and are often referred to as "wild geese."

But all this is speculation.
See Stan Hugill, "Shanties from the Seven Seas," pp. 181-182; reprint edition (2003 printing) by Mystic Seaport (Museum), Mystic CT.