Chile received the top score of all nations polled, at 71.9. The Southern Cone country has long been considered a leader in the region for democratic and economic stability, which has translated into a better quality of life for Chileans, as this survey measures. It places in the top three for 11 out of 15 variables measured. One notable exception is its position next to last in terms of civil society participation. That has started to improve with student protests that have swept the country over the past year, but overall it points to a need for political renovation in Chile, says Mr. Sabatini.

Roberto Candia/AP
Demonstrators, some riding bikes, protest in Santiago, Chile, Wednesday, April 11.