In fact, here we are ranked right under (20th) the US (19th) in terms of transparency:
http://www.transparency.org/country#CHL http://www.transparency.org/country#USA_DataResearch
Argentina is ranked 102: http://www.transparency.org/country#ARG_DataResearch
In all of Latin America, the closest countries to Chile in that transparency ranking are Costa Rica, with the 48th place, then Cuba 58th and then Brazil 69th.
Edit: added justification data with links / I'm proud of Chile