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Notes -
As has been mentioned below, it depends what you mean by "more biodiversity". I seriously doubt this is true in an absolute sense - North America covers a much larger range of biomes than the Galapagos and therefore likely has a higher total number of species. On the other hand, the Galapagos might win out if you're measuring biodiversity by species per square inch, but that's to be expected given that the Galapagos is situated in a warm equatorial environment whereas North America is a much larger landmass that includes extremely cold northerly environments and contains biomes like taiga where biodiversity is generally low, so that drags down the average.
It makes sense that this would be the case. The geographical isolation of populations from each other allows for allopatric speciation, where two populations of the same species diverge because they get to develop in isolation without gene flow between the groups (example: the Abert and Kaibab squirrels). Populations being dispersed into several small patches of habitat as opposed to a few larger ones clearly helps enable this process.
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