Imagine if you will, a world where Salvador Allende's campaign gets derailed by a scandal of some sort combined with the evidence of both CIA and KGB involvement in directly funding the campaigns. Offended chileans instead turn towards Radomiro TomiÄ Romero and he wins the election of 1970.
What changes with the national congress confirming Tomic as president? How does modern chile develop under the centrist left-liberal Christian Democratic party of Tomic as opposed to either Allende's radical leftism or Pinochet's turn towards rabid neoliberalism. Even just removing the economic sanctions and CIA-sponsored strikes/unrest against Allende and the disasterous economic policies of Pinochet would have _some_ effect.