How do Clash of Nations lineups get decided?

It's not like the world cup where the actual government of a country assigns a coach to put together a team right?

Who tf decides who's on team Spain, team France, etc.?

no clue tbh
every team has a captain so ig he could be the one who fills in the rest of the team (after the content creators get added)

edit: o wait clash of nations is something different? given the description I think we're talking about Spike Nations, sry if thats the wrong thing

Will there be a Clash of Nation event soon?