Kneejerk response is to tie our ethnicity to a geographic space. e.g. native towns
Below is an attempt to transcend narrow territorial affinity, and affiliate to an intellectual tradition linked to ethnicity
In this case
Vedic polytheism
Shrauta ritualism
As a section of smArthas have been remarkably successful in preserving a certain affinity to old-style polytheism, as well as adherence to Vedic ritual
A continuity that arguably goes back 3000 years
For all we know, most of our "native towns" have been home to only our immediate ancestors (for not more than 200-250 years in most cases)
In my own case -
Paternal "native place" : Srirangam. But my folks moved there in mid-19th century from a hamlet near Kanchipuram
Maternal "native" : Krishnapura near Mysore. Again folks moved there from Tiruvallur near Madras in mid 19th century
It has always been there...
In very few cases can we claim that our ancestors were in exactly the same village/town 500 years ago