For the past decade, Brazil has lurched from one crisis to the next: environmental destruction, an economic recession, one president impeached, two presidents imprisoned and a pandemic that killed more people than anywhere else outside the United States.

On Sunday, Brazilians will cast their ballots for their next president, hoping to push Latin America¡¯s largest country toward a more stable and brighter future ¡ª by deciding between two men who are deeply tied to its tumultuous past.

The election is widely regarded as the nation¡¯s most important vote in decades, historians in Brazil say, in part because the health of one of the world¡¯s biggest democracies may be at stake.