What factors would allow for two dominant species on a world?

On Earth humanity has taken the dominant role (excluding dolphins and mice of course). We know of conflicts in pre-history where our ancestors have overtaken other species and slowly wiped them out.

What circumstances would allow two (or more) species to evolve on a planet side by side? What could have happened differently to allow Neanderthal man and our ancestors to survive and thrive to the present day?

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What factors would allow for two dominant species on a world?

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