> South American countries don't go to war with each other No? Here are some examples I found: https://en.wikipedia.org/wiki/War_of_the_Pacific https://en.wik

> South American countries don't go to war with each other No? Here are some examples I found: https://en.wikipedia.org/wiki/War_of_the_Pacific https://en.wikipedia.org/wiki/War_of_the_Pacific https://en.wikipedia.org/wiki/Peruvian%E2%80%93Bolivian_War_of_1828 https://en.wikipedia.org/wiki/Peruvian%E2%80%93Bolivian_War_... https://en.wikipedia.org/wiki/Peruvian%E2%80%93Bolivian_War_of_1841%E2%80%9342 https://en.wikipedia.org/wiki/Peruvian%E2%80%93Bolivian_War_... https://en.wikipedia.org/wiki/Paraguayan_War https://en.wikipedia.org/wiki/Paraguayan_War https://en.wikipedia.org/wiki/Uruguayan_War https://en.wikipedia.org/wiki/Uruguayan_War You may argue these were all in the 19th century, and that is true. It's possible South America learned their lesson from the world wars. An alternative explanation is the presence of the US. It was never going to let another regional power roll up smaller states in the Western hemisphere so there was no point in being expansionist.