What changes in history would have to be made to be possible?
Maybe chile be part of the Viceroyalty of the Río de la Plata and then part of the United Provinces? What would be the effect of this for BRAZIL, SOUTH AMERICA, AND THE WORLD?


The Falkland Islands?

Would the United Provinces be allies of Brazil or Great Colombia or Peru or would they isolate themselves from the South American conflicts?


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This does remind me of something similar I did where I united Argentina, Chile, Paraguay and Uruguay but that what under different circumstances

Back on topic, I don't think I would have much of a great effect on the world, maybe in South America. But if you can avoid Many Problems that Plague These Countries and get a baby boom since both countries have low pops

Unless Some kinda of weird evens were a democratic or a non-dictatorship government tries to shift their population attention to the Falkland because of some kind of Economical problem or something else happens I don't see a reason to invade the Falkland since stable Democratic or Non-dictatorship government don't tend to invade others
The difficulty here seems to be the administration of both Chile and Argentina and that the two colonies would be most logically set up to govern themselves; unification requires convincing the other party that it is necessary and beneficial to give up the administrative independence that they previously held. In any case, Rio de la Plata would basically have to absorb Chile, either before independence or early on in the years following independence.

As for the war of the Pacific, the fruits of a victory are just as irresistible as they were to Chile by itself. At the same time, Argentina will be the dominant partner in such a relationship and winning Bolivian and Peruvian resources is less vital to the overall nation's economy. It may prefer to keep relations with Peru and Bolivia strong and could not wish to risk war unless it feels it can win effortlessly. I do not know what the trade and diplomatic relations were between the governments Lima and Buenos Aires were like at the time however.
The unification need to be before 1839, why? Because on that year, Chile fought the War of the Confederation, against Peru-Bolivia Confederation. Why this is important, because after that war, and to be exact, after the Battle of Yungay, chileans united for the great will of Chile and a great feeling of patriotism born on the chileans. That's why Chile is so different from Peru or Argentina, even it spanish accent is MORE different than andean or platean spanish

So, we need unification before 1839, the problem is the Andes, a bug f*cking mountain range that divides Chile and Argentina, with few corridors that close on winter. That means that comunications between Santiago and Buenos Aires took weeks and both sides were having problems with the reorganization of their country, Chile had civil wars which finished in 1830, meanwhile Argentine finished her civil wars in 1880.

So you have 3 possibilities

1. Avoid or finish argentinian civil wars before 1830-1839, then try to unite with Chile or conquer it
2. Keep Libertador San Martin as leader of both nations, then unite them and avoid civil wars from happening
3. Have Chile to colonize and conquer the Patagonia way before Argentina, so you can have a reduced Argentina and a bigger Chile, while it does not unite the whole South Cone, you'll have a bioceanical and relatively stable country to start with

In OTL Chile did a great advance colonizing the Magallanes Strait, but did not have the power or the will to quickly colonize the rest of the Patagonia before Argentina, that why whe have the Treaty of 1881, which concedes the eastern Patagonia to Argentina and western Patagonia and Magallanes Strait to Chile, following the idea that Chile belongs to the Pacific and Argentina to the Atlantic. Unification or anexation attemps after 1881 were impossible and would end in great war involving Peru, Bolivia, Brazil and who knows which other countries
Under the Spanish colonial system, Chile and La Plata were colonies governed separately and of different hierarchical rank .. while one was a viceroyalty the other (Chile) was a general captaincy dependent and ruled by the viceroyalty of Peru.

Chile on the other hand was liberated by an army formed in and from La Plata (which was joined by the remnants of the defeated revolutionary/independentist Chilean forces). After achieving the victory and therefore the situation of fact of the Platense army was the unique military force organized there and by the patriotic solidarity (common to the time and region) ... for a short period of time Chile, in fact, depended and was integrated into the Plata.

But the hypothetical small 'window of opportunity' (for the objectives required for the OP) of a permanent integration into a larger political organization was closed and/or wad a los /'failed' opportunity in OTL mostly by the centralist / unitary ideology and monarchical policies that from Platense revolutionary leadership supported from part and the consequent political and military chaos provoked by the rebellions and regional political challenges to these policies, the ambiguity of the political-economic objectives of the 'Porteña' (from Bs. As.) oligarchy and the subsequents repression/civil wars.

But in any case and given the above described (synthetically) political situation that made impossible in OTL, any desire or possibility of union lost attractive and viability for the Chileans while reinforcing their logical autonomist / independentistas tendencies and finally the same question of a Possible membership / political union with the Río de la Plata, become superfluous after the 'Liberating Army' departed north to attack the realistic bastion of the Viceroyalty of Peru.

Therefore, in my opinion, the necessary conditions, but not enough, for a more or less permanent political union to take place would be, on the one hand, that the offensive against Peru would not be continued, while the liberation army remained in Chile.
On the other hand and more important a 'fast' and permanent triumph of the federalist / autonomist political / military forces.
This would at the same time avoid the institutional chaos and political-military anarchy (with logical material destruction) of OTL, with the logical advantages derived from the fact that they would probably establish the type of government than being attractive to the Chileans and other peripheral proto nationalities).
Could offer Chileans a respectful integration and which would guarantee their administrative and political autonomy while giving them the economic and political advantages of belonging to a common nation / federation.

A Supra Nation of that type formed by the majority of the territories of the former Viceroyalty of the Plata and Chile ...
it's probably that the war against Peru would continue ... but with the 'goal' to reconquer the territories of the 'Upper Peru' (that were formed, approximately, by part of extreme north Argentino and present-day Bolivia) and eventually continue the offensive against the Peruvian realists, from there rather than invading from the Pacific coast as it should be done, in OTL).

Finally, relations with Brazil would be tense at best, as long as it remains as a Monarchy and it is more likely that sooner or later there will be an open conflict to determine the hegemony of the region (for the possession / control of waterways and Its hinterlands) and / or by the real or perceived support, by the Emperor of Brazil, of the probable Brazilian secessionist / republican movements.

Finally about the Falklands, their importance was more for the whale's hunters ships refuge and eventually a resupply place for them and/or the Royal Navy (and one place that anyway wasn't OTL, very important or strategic for British.
But it's possible that the Falklands/Malvinas islands TTL, would have been more populated than in OTL and with a strong state with a stable central government a suitable garrison would have been sent/ established and there would be at least some ships destined there.
Also would be regular communications / transportation with the mainland instead of the isolation of OTL.
Its importance could have been increased for the hypothetical new Bioceanica nation of the 'southern cone'.
Because these islands would have become, probably on a scale, more or less obligatory / necessary for the naval traffic and of course for the maritime trade both from Chile towards the Plata and vice versa.
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