Civil War is too kind of a description for what took place in Guatemala. If you check Wikipedia you will see it was a US CIA funded genocide against the very poor people of Guatemala and to Support the US Corporation called the United Fruit Company from perceived threats from very poor people and labor organizers. Over 200,000 thousand people were killed or went missing with the vast majority of them being peasants, leftists, labor leaders, and people with a social conscience. It was so bad that even today people in Guatemala don't want to discuss it.
"I have approximate answers and possible beliefs and different degrees of certainty about different things, but I am not absolutely sure about anything." Richard Feynman, Cal Tech Scientist