Chile is heading into a high-stakes presidential runoff defined by sharply contrasting visions of the country’s recent past and visions for its future.

Chile is bracing for a tense presidential runoff after a first-round vote on Sunday set up a showdown between a member of the Communist Party and an ultraconservative veteran politician, sharply polarizing the country between the political left and right.

Chile seemed on the cusp of a progressive revolution last year when a committee dominated by leftists drafted a bold new constitution to replace the country’s dictatorship-era charter.