How common were the South American wars in the last 200 years?
In the 19th century, wars and conflicts were extremely common within South America due to struggles for independence from European rule and subsequent civil wars over borders, leadership choices, and other civil issues.
Almost every single nation in South America was at war or declared war at some point during the 19th century, but in the last century, there have been no major conflicts between any South American nations. Rebellions and civil wars have occurred in many regions however, particularly at the height of the Cold War when American and Soviet intervention saw severe escalations in rebellions and large scale violence.
Although no major wars have been declared in South America since before the First World War, this does not mean that deaths and injuries from violence and warfare have not been common, as millions of individuals have been killed in small scale conflicts throughout the continent.