In short dark people came to India first and fairer people migrated afterwards.
All humans were dark when they came out of africa....those who staright away migrated to hotter regions like India stayed dark while those who remained half way in central asia became fair because during that time it was much colder. Then from there they migrated to all over the place.
Im talking about thousands of years ago...
But the arians will tell you something else.
They can't explain why people from the same region have different skin tones.
Absolutely Central Asian steppe region was like an incubation chamber where the cooler climate allowed the development of Light Complexion.
I grew up in Delhi and I have seen plenty of people from certain castes most of whom have Dark skin, darker than mine.I do not want to mention the name.
At the same time there are many high castes, most of who have light complexion.
How come people from the same region have different color tones?
Gujarat and Chattisgarh are situated along the same latitude. Then why is there a difference in complexion between upper caste Gujaratis and Tribals in Chattisgarh?