Alternate his scenario:

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What if nobody existed but Tongans? Let's say all ancestors of humans emigrated to Tonga, and those who didn't just vanished out of thin air. The only humans in the world to discover fire, invent the wheel and further develop were Tongans. A major constraint would be their limited material availability due to the fact Tonga's tiny as well as the surrounding islands, and thus a lack of population growth. Perhaps there would be adapted technologies like proto vertical farms to support population growth?

When would they start settling on other Polynesian islands? On Melanesian ones, then New Zealand, Asia and the Americas? Proportionally speaking newfound lands would be fucking massive compared to what they know. That'd be goddamn exiting.

Would these migrations somehow cause genetic diversity as settlers may get exposed to different physiological treatment in food, climate etc and may lose connection with home if bureaucratic disorder occurs? Would the world eventually balkanise into many states? What are some realistic scenarios, because there are many possibilities