South America includes Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, the Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, South Georgia and South Sandwich Islands (SGSSI), Uruguay and Venezuela.
You can find legal research guides for most South American Countries on Globalex. Other useful guides include A Brief Guide to Select Databases for Spanish-Speaking Jurisdictions and A Guide to MERCOSUR Legal Research: Sources and Documents.
The Martindale-Hubbell Law Digests provide a summary of the laws of many South American countries. See "Martindale-Hubbell." See also "Foreign Laws."
The subscription-based MicroJuris offers primary legal materials from Argentina, Chile, and Venezuela.