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Instead of OTL's situation, Spain getting the Andes with extensions to the Carribbean and South Atlantic, while Portugal and northern Europeans got Brazil and the Guyanas, how can we have South America fall under one colonial rule (all-Spanish, all-Portuguese, all-somebody else) and never have a competing colonizer even if independence comes to most or all of the continent. How will this affect the geopolitics and society of the continent, and could it plausibly lead to an eventual independent state occupying the entire continental territory?
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