IMO, it ended when Rhuvanland surrendered to the Argent Alliance. In the new canon, Syrixia would be a member. The Denazoification process would be similar, except with Argent rather than August supervision; and it is more than likely that the Argent Alliance would remain an organization, perhaps similar to Trillium.
If the former Argent members would like to go deeper on this idea, I'd be glad to expand on it. I think those members were Wolfsea, Yeraennus, Trinster, and Esplandia; if I missed some or stated some nations were in it that weren't I apologize and I hope there can be clarification.