Many thanks for your detailed and thoughtful blog. The photos are excellent, and help the reader share your experiences. Can't wait for the sequel!
I was happy to see that you ventured off the Panamericana during your trip. Too many travelers just focus on reaching Ushuaia. Perhaps it's time pressure.
There are places in South America that are analogues to the African experience. Eastern Bolivia, for example, is similar to east Africa (minus the large game herds, of course.) Dusty tracks, isolated villages, Maned Wolf, Jaguar, lots of pristine areas untouched by development. Central Brasil has areas that feel like west Africa, with lots of difficult muddy tracks, unregulated "wild west" resource extraction activities, and a sort of "Heart of Darkness" attitude. Northeast Brasil has thorn forest and dry lands similar to parts of sub-Saharan Africa. Brasil's Pantanal has similarities to Botswana's Okavango Delta (no hippos, though). And so on.