Having lived most of my life outside the country of my birth I often have thoughts about this. For many people, group identity is a matter of importance. Here in Israel/Palestine I have seen many newcomers go to great lengths to integrate into one or the other society. Some people also seem to see a deficiency in their original identity, and try to adopt a new identity even without really needing to on a practical level.
This Guardian piece is mildly interesting: "White supremacists stole my identity to spew hatred on the Times of Israel: one day I awoke to a barrage of posts from strangers accusing me of racism for an article I didn’t write.