RIO DE JANEIRO, BRAZIL - There was nothing left in Chile of what was once the center-left Concertación, which ruled between 1990 and 2010, after the dictatorship of Augusto Pinochet. The alliance, whose backbone was the Christian Democracy and the Socialist Party, was dying little by little and ended up dying in the left-wing government of Gabriel Boric, when the socialists entered the Cabinet made up of Boric's original coalition -the Front Broad and the Communist Party– unlike its Christian Democrat partners. But the Chilean constituent process has revealed, once again, the crisis in which the moderate . . .