I use this list with a reading of "En el tiempo de las mariposas" by Julia Álvarez and my Internal Conflicts Project (available here: https://www.teacherspayteachers.com/Product/Project-Internal-Conflict-Civil-War-Dirty-War-1759077).
It is a list of fifteen civil wars, dirty wars, dictatorships, guerrilla wars, etc. of the 20th century. Some of the countries represented include Argentina, México, Chile, Colombia, El Salvador, Guatemala, Puerto Rico, Brazil, and Spain.
I cut the list into strips and have students draw the strips from a bag to decide which country they will research, but the list could also serve as a reference for teachers preparing similar units.