Is it just me or do "American Indians" of South America & Mexico have very similar looks & nature to people in Iran, India, Afghanistan, etc?

I think if you were to take "Mexicans" and drop them off somewhere in , say Iran or Afghanistan or India even. that they would appear to fit right in. their nature is also very similar as well as their looks to people I have met from Iran, Afghanistan and India . how true and why?
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