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Apparently, in 1831 when the Beagle arrived at Salvador in Brazil, Darwin had a serious disagreement with Robert Fitzroy, the captain of the Beagle, over slavery and was banned from his company. In OTL Fitzroy got over it and apologised, but what if he did not, and Darwin left the Beagle at Salvador? Where, from whom and how does a theory of evolution and natural selection arise now? Perhaps Alfred Wallace? Or from where?