Why is there so much Tribal Infighting in PNG Island? What’s the short history of Papua New Guinea that helps us understand its current affairs?

Question

https://apnews.com/article/papua-new-guinea-landslide-yambali-enga-642d9e8e0c913efa25ed2d67df318393

I just read today they attack support convoys for landslide victims which is such a terrifying thing to do to one’s own country.

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