A reader writes:
Argentina (as a country) did not legalize civil unions, the City of Buenos Aires did. Argentina (its a matter of Federal law) does not permit adoption of children by same-sex couples. Hopefully Congress and/or the Supreme Court will take up these issues soon. Argentina is an interesting case, it's 90% catholic and quite conservative, but for some reason (probably as a reaction to the years of the Dictatorship in the 70/80s and as a consequence of the internet, flow of information, etc. in the last decade or so) progressive positions are adopted (See, for example, here.
Argentina's Supreme Court decriminalized the small-scale use of marijuana on Tuesday, opening the way for a shift in the country's drug-fighting policies to focus on traffickers instead of users).