“…Various authors highlight the importance of presidential diplomacy and the ideological components as the booster of regionalism in South America. The literature has focused on the causes of this shift (Riggirozzi and Tussie, 2012, Legler, 2013, Petersen and Schulz, 2018 being the most important alleged reasons the rise of numerous left-wing governments at the beginning of the 2000s that allowed the constitution of Unasur. However, other authors (Caetano, 2009, Malamud and Gardini, 2012, Quiliconi and Salgado 2017 argue that even though there was an ideological coincidence of governments in power, the outcome of regionalism is still uncertain and ideological convergence has not acted as an engine to deepen regionalism rather generating a proliferation of new organizations.…”