Ranger:
If you simply enjoy singing shanties, have fun. Don't let me, or anyone else, rain on your parade. But seriously, French Caribbean calypso was taken from Portuguese gritaria before the colonials were Americans. As a public servant/teacher, just how old do you think your language is versus the Western world's maritime?

Most of the shanties before the 19th century are of British origin...
The genre label first appears in the late 19th as a pop culture term. It was never used in naval science... not ever.

...most of those from the 19th are American.
And only Anglo-Americans used the genre label. The rest of the planet has their own stuff as is only natural.

Shanty singing declined in the late 19th and early 20th centuries, when steam-powered ships replaced sailing vessels.
Except for song books and summer camps and folk albums and uni classes and video games and TikTok and your CD &c. &c. It's the nonfiction what died out. The fiction and fantasy and fun are doing just fine at present.