What if the Amazon rainforest were flat plains like the Pampas? What effect would this have on Brazil and the rest of South America?

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This question butterflies away the importance the rainforest plays in the ecosystem (let’s just say another massive rainforest exists in another part of the world)
 
This is outside of human control, so it belongs in the ASB forum.
But we may see a much bigger population in the region, Portugal would also have one of the best lands in the Americas (assuming the rainforest isn't in another region of Portuguese America) which would attract many settlers, and in the future immigrants.
 
But we may see a much bigger population in the region, Portugal would also have one of the best lands in the Americas (assuming the rainforest isn't in another region of Portuguese America) which would attract many settlers, and in the future immigrants.

Of course, before all that, there is the possibility that the Incas might expand further on that region than they did OTL.
 
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CalBear

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This is an ASB subject since it requires a geologic change.

However, in ASB it would be closed as Frivolous (in this case since it isn't well defined, and basically a one liner).

Just to save a step I'll lock it here.

OP is free to further develop the scenario and post it in ASB.
 
Firstly, if the Amazon Rainforest didn’t exist the Sahara would be green. The climactic cycles of the Amazon and Sahara are codependent and in that way, Sand dust that flies from the Sahara to the Amazon, which carries phosphorus is what makes the Amazon thrive with life. The only way the Amazon would be “like the pampas” would be if rainfall increased heavily in the Sahara. Rather than being prime grazing land however, it would most likely resemble the Sechura desert. This is just as interesting however. In all likelihood there would be a lot more native activity in the region in precolombian times. The Amazon River could become of huge importance, I could see whole new civilizations forming around its basin. The Chibcha tribes of Colombia might expand further south, and the Incas could possibly expand past the Andes mountains, though it is unlikely, the Andes were a natural barrier for the Incas and their irrigation and road systems complicated as they were were already probably at their maximum extent. What is possible however is that the Incas have more contact with other peoples outside the Andes. East of Bolivia might be a great place for a new civilization to emerge
 
Firstly, if the Amazon Rainforest didn’t exist the Sahara would be green. The climactic cycles of the Amazon and Sahara are codependent and in that way, Sand dust that flies from the Sahara to the Amazon, which carries phosphorus is what makes the Amazon thrive with life. The only way the Amazon would be “like the pampas” would be if rainfall increased heavily in the Sahara. Rather than being prime grazing land however, it would most likely resemble the Sechura desert. This is just as interesting however. In all likelihood there would be a lot more native activity in the region in precolombian times. The Amazon River could become of huge importance, I could see whole new civilizations forming around its basin. The Chibcha tribes of Colombia might expand further south, and the Incas could possibly expand past the Andes mountains, though it is unlikely, the Andes were a natural barrier for the Incas and their irrigation and road systems complicated as they were were already probably at their maximum extent. What is possible however is that the Incas have more contact with other peoples outside the Andes. East of Bolivia might be a great place for a new civilization to emerge
Most of the Sahara was partly greened ten thousand years ago while the Amazon is tens of millions of years old, or am I overstating the relevance of the Sahara being greener?
 
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