What Could Cause Humans To Fracture Into Many Multiple Species?

There are thousands of species of spiders on Earth. Ditto insects. And, prehistorically, there have been times when there have been several, or even half a dozen species of hominins in existence on Earth at the same time. But, now, there appears to be only one species of genus Homo on Earth.

What circumstances could plausibly cause Homo sapiens to fracture into multiple species again?

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What Could Cause Humans To Fracture Into Many Multiple Species?

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