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I am working on a timeline where the British capture the Rio de la Plata in 1806, making it a settler colony, and becomes its own dominion in the 1920s, and independent in the 70s or so. Let's say that this dominion grows to encompass the majority of OTL Argentina and Chile, while a second dominion splits off, encompassing Uruguay, and part of Brazil up to and including Sao Paulo state. Now there are two additional English-speaking countries in South America. What would these colonies be called? What would they be called when they become independent? I doubt Patagonia or "British South America" would be long kept. Any ideas are welcome.
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