La Violencia! is a Timeline Event that can occur from 1952 to 1956.
While the event is happening, no food can be imported - due to the lack of farming - and the commodity price of corn increases by 200%. Exporting corn to hungry nations in dire need of food is a good way of earning money early in the game.
La Violencia (the Violence) was a conflict between supporters of Colombia's Liberal and Conservative parties. The fighting largely took place in the countryside with no security or public order, forcing millions living in rural areas and farmland to flee for safety.