Mangareva, Pitcairn, and Henderson Islands

There are 2 main problems that Mangareva, Pitcairn, and Henderson islands had, they were:

• Civil War
• Unsustainable Development

Instead of having hereditary chiefs, which meant they would fight each other to get the position, Moreover, because the didn't use the resources wisely and unsustainably therefore people fought for food because foods are human basic needs. They overused and overgraded the lands for farming and deforestation, erosion are the consequences.
There are solutions they should have done to avoid those situations, there were:

• The first chief who ruled the island should have annouced that only his descendants could continue his career, no one else. If the rule was set up like that, it will create a more stable structure of society in the island.
• Instead of overused lands to farm, they should have taken the advantages of seafoods and use that as their main food. Or they should change to be vegetarians and then they wouldn't need to graze livestocks anymore and slow down the process of deforestation.