tbh not many American zoos have South American sections, let alone good ones. The only good ones I know of are Miami’s Amazon, Houston’s Pantanal, National’s Amazonia and my personal favorite, Dallas World Aquarium. Is this the same in Europe and Australia?
Within the last years I think the focus on South American animals and areas in European Zoos got bigger. Last year I discovered the Zoo of Paris that has two big Southamerican Areas (Guyana Rainforest and Paragonia). Also I love the South American Aviary and South American area of Due la Fontaine. Some French Zoos only consist of a South American are (I guess it is Parrot world). And in Zoo Beauval one of the newest attractions is also an South America aviary where plenty of Macaws, Flamingo, waterfowls, anteaters, howler and spider monkey live together in one big aviary.
In Germany some of the most popular zoos have South American areas besides there Asian and African areas, like Zoo Leipzip. Of course the African areas tend to be bigger, but Zoo Leipzig e.g. is now building "Feuerland" with focusses on the South American coasts. I will present Sea lions, Humboldt penguins and macaws in big new exhibits next to the South American animals they are already housing like anteaters, maned wolfs, peccaris, coatis, capybaras, tapirs, maras, flamingos, rheas and vicunas. In the rainforest domes one area is also dedicated to the Amazonian rainforest showing giant river otters, ocelots, sakis, squirrel monkeys, pygmy marmosets, piranhas, sloths ...
And many of the new exhibits in German zoos are build for South American fauna aswell. Münster just opened their new Meranti-Halle. In Cologne Zoo the South American area got some rework especially the beautiful Reichert-House, in Duisburg they just built new exhibits for Spectacled bears and a small rainforest dome around Manatees and Giant river otters which also holds tamaduas, sloths, monkeys and tamarins, in Zoo Krefeld they always focussed on South American fauna and in Switzerland Zurich they are just constructing a big new Pantanal aviary where Anteaters, Tapirs, Flamingo, Macaws, Tamarins, River Otters and monkeys will all live together in one big biome-exhibit.
So I guess yes, within recent years South American fauna got some more importance and focus in European zoos.