There are very few stations in South America with long-term data.  Here are a couple of them from NASA GISS V2.  Both showed a similar pattern with warmth before 1920

Data.GISS: GISS Surface Temperature Analysis
Data.GISS: GISS Surface Temperature Analysis

In GISS V4, the unadjusted data has changed to erase the heat of the past.

Data.GISS: GISS Surface Temperature Analysis (v4)
Data.GISS: GISS Surface Temperature Analysis (v4)

How does unadjusted historical data change over time?

Data.GISS: GISS Surface Temperature Analysis
Data.GISS: GISS Surface Temperature Analysis (v4)