Colombia’s La Violencia
ND – MPE: 0.15
The Wikipedia-article called “La Violencia” cites estimates for the number of civil war deaths in Colombia from 1948 to 1958, which range from 0.2 to 0.3 million. I found no estimates for the number of civilians killed.
The US supported Colombian governments during “La Violencia” with weapons, especially the dictatorship of Gustavo Rojas Pinilla.
Plausible estimates for the number of civilians killed by nondemocratic forces range from 0.1 to 0.24 million. I choose 0.15 million as the most plausible estimate.