I think that the border between Antarctic France and Brazil would indeed be at the level of the Paranapanema river, which is almost the exact border between the OTL states of Parana and Sao Paulo (as a result, Antarctic France would also own the southern part of OTL Mato Grosso Do Sul). And Antarctic France will effectively extend as far south as possible until it can reach... Antarctica!A few thoughts:
First, on the border between France Antarctique and Portuguese Brazil, may I suggest the Paranapanema River as a natural geographic boundary between the two? Maybe even the Tiete River if the French get really lucky, but I think the former is more likely. Overall, I think the border between Brazil and France Antarctique would be approximately the border between OTL's Brazilian states of Sao Paulo and Parana.
Second, with so many of France Antarctique's inhabitants being resentful of the French crown, I think France Antarctique could be the prime candidate to revolt against their mother country, especially if many of TTL's French Enlightenment figures go to France Antarctique. A Protestant, Republican Antarctique and a Catholic, Monarchist France would be an interesting outcome for TTL.
And last, will France Antarctique eventually reach all the way down to Tierra Del Fuego? I think it would be likely, considering that the French population would be far larger than OTL's Southern Cone, and thus they'd want to expand as much as possible, even to the very bottom of the continent.
It's definitely possible as the Spanish wouldn't have that good of a navy by the 19th century, and I think there may be a possibility where the English + French help the Antarcticans (it's the French Antarctique, so that's the name in running with). There's a great possibility that a rebellion occurs in Chile that allows for the full invasion of Chile as the people there are cooperative.
Yes, Henriville corresponds roughly to OTL's city of Rio Grande.It was mentioned that Henriville was built at the mouth of the Lagune des Canards, which would be OTL's city of Rio Grande, so that's where I'm assuming Henriville is. Can you confirm this?
BTW, I think you should add threadmarks for each of the updates. It makes reading the TL a lot easier.
My mind was elsewhere last week, but I'll come back and post a new part in 1-2 days. It's possible that I'll be away for a while sometimes, I work a lot by energy peak.I know it's only been ten days, but I've got to ask if anything is coming for this TL. You were posting updates left and right for a good few days, and while I expected the pace to slow down, the fact that this thread has been completely dead since then is concerning.
I meant catholic emigrants from France, since in story you stated a major reason for the purchase being the Huguenot majority of the colony nor being favored by the court.There are already all the evangelized natives and the tens of thousands of Hispanics left in Chile, Chile is already overwhelmingly Catholic.
Chile is still far away and difficult to live in, so the catholic emigrants who want to go there are quite few, they prefer the other colonies on the Atlantic coast.I meant catholic emigrants from France, since in story you stated a major reason for the purchase being the Huguenot majority of the colony nor being favored by the court.