Argentina, from 1965 to 1976, experienced three major changes of power, two of which were regime changes. What caused all the instability in such a short period of time? The tranquility of the early sixties was shattered by political violence. In 1965, there were fewer than ten incidents per month. By June 1976, before the last military coup, there were over 300 incidents per month. With historical and quantitative data, this analysis will show how political violence can undermine regime stability. Original data were generated to study the consequences of political violence during this period, based on Argentine news sources.