As a continuation of yesterdays theme:

The first dinosaur fossils from Patagonia to come to the attention
of the scientific community were discovered by an Argentine army
officer, Captain Buratovich, near the city of Neuquén in 1882...
Buratovich was sent to Patagonia to conquer land inhabited by the
native peoples, and like other regrettable military campaigns in other
countries, this one resulted in the systematic extermination of most
of the native tribes in Patagonia.

Luis Chiappe & Lowell Dingus:The Lost Dinosaurs. The Astonishing
Discovery of the World´s Largest Prehistoric Nesting Ground(2001),
page 30.

My yesterdays numbers for indigenous people in Argentina was little
bit dated, from a book in the early 90´s. A later work claims 500 000
indigenes. Huge discrepancy, but not hard to explain, if one considers
the huge rise of the number of native peoples in for example US
censuses, which one reason has been that people are now more eager
to claim aboriginal identity than before.