Douglas Harper's Etymology Dictionary
ethnogenesis
1957 in modern usage, from ethno- + -genesis "birth, origin, creation." It was the title of an 1861 poem celebrating the birth of the Confederacy by U.S. Southern poet Henry Timrod (1828-1867).
Wiktionary
ethnogenesis
n. The emergence of a distinct, recognizable, ethnic identity.
Wikipedia
Ethnogenesis
Ethnogenesis (from Greek ethnos , "group of people, nation", and genesis , "beginning, coming into being"; plural ethnogeneses) is "the formation and development of an ethnic group." This can originate through a process of self-identification as well as come about as the result of outside identification.
Usage examples of "ethnogenesis".
For that matter, long term, we're going to see a lot of ethnogenesis going on in the next generation or so.