Brazil is a 'nation'/federation. I mean, it all started 15 years ago or something with Leandro Ribela and one or two other pioneers, who's names I'm not sure about (possibly Helio Freitas was one of them).
Nowadays there's a big shift between the old and young generation: Leandro Lutz, Fabrizio Bourguignon among the men, Mika Picin for the women, although they're not all competing anymore this season. I think they more or less started independently, but then there's the young generation: Bruna Moura, Gabriela Neres, Lucas Martins, Victor Santos, Caio Moreira (retired since a few years already to focus on personal stuff, I was sad to see him go but am happy to see he's happy and very well), all of whom started with cross-country and biathlon more or less via Leandro Ribela's social project Ski na Rua. There's also Matheus Vasconcellos in the Junior Cup, probably the Brazilian with the most potential, but he mostly grew up in Austria (speaks fluent Austrian-German with a thick local accent) and doesn't have that much to do with the project and all.
On the other hand, in Greenland it's all Slettemark Australia is a whole different story that probably would require more reading material than the entire Lord of the Rings/The Hobbit universe, so not gonna get into that