Perhaps a combination of the following factors:
- Several colonizers, all of which retain their colonies.
- No inclusive colonizers. All of them seek to take land. Perhaps the Huguenot conflicts make French Catholicism extra fervent, and they won't accept the pagan natives. And the Dutch are forced to place armed, landhungry settlers to defend their colonies because of extra Swedish/somebody-else presence.
- New religious group moves in with the natives. They spread technology, immunities, and a 'heretic' version of Christianity, but become assimilated culturally and genetically.
- In the English colonies in the South, white indentured servants and black slaves unite to depose the leaders of the colonies, then focus on being excessively brutal to the natives. This both unites the natives against them, and will lead up to an English attempt at reconquest, which will harm the colonies.
- Natives that get pushed out, are hired/incorporated by other tribes. That, or the more assimilating groups like the component tribes of the Iroquois Confederacy take predominance.
- Tecumseh analogue.
- Several colonizers, all of which retain their colonies.
- No inclusive colonizers. All of them seek to take land. Perhaps the Huguenot conflicts make French Catholicism extra fervent, and they won't accept the pagan natives. And the Dutch are forced to place armed, landhungry settlers to defend their colonies because of extra Swedish/somebody-else presence.
- New religious group moves in with the natives. They spread technology, immunities, and a 'heretic' version of Christianity, but become assimilated culturally and genetically.
- In the English colonies in the South, white indentured servants and black slaves unite to depose the leaders of the colonies, then focus on being excessively brutal to the natives. This both unites the natives against them, and will lead up to an English attempt at reconquest, which will harm the colonies.
- Natives that get pushed out, are hired/incorporated by other tribes. That, or the more assimilating groups like the component tribes of the Iroquois Confederacy take predominance.
- Tecumseh analogue.