Not that I agree with fucktory, but I suspect europeans, east asians, middle-easterners underwent a very rapid acceleration in evolution with the advent of agriculture, settled life and urbanization over the last 8000 years. Agriculture resulted in massive population booms and increased competition from others— an IQ arms race. Inuits were still living in sparcely populated areas as hunter gatherers. Less competion. Less evolution.

after looking at a map, it sure seems like there is a coloration between cooler climates and higher iq

also the eskimos are not really the same thing, in the situation above you would have had a large population slowly adapting over potentially millions of years until they evolved enough to build ships capable of leaving due to a worsening climate, the eskimos took a different evolutionary path by filling the niche of super cold weather hunters