As is well known, Mercosur was conceived as an economic bloc. However, over time, it has also behaved as an international coalition. This article aims to trace this process in the period 1991 to 2012 via two indicators: the voting behaviour of the four original Mercosur member states in the United Nations General Assembly, and positions adopted on international political issues in the communiques emanating from the biannual Mercosur presidential summits. The period under review will be divided into two further periods,
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