I dont think it a controversial fact but you have a valid point Without a sourcetrust me there really isnt one on immigrants to the Unites States from the rather newly independent nation state of Azerbaijan it is best to leave it out An Azerbaijani is technically only a nationality and not an ethnic groupie Azeris for example most of which actually live in Iran Pigeonholing them with predominantly anything needs a clear source and as such the data appears lacking On the other hand many of the articles relating to this region are constantly under attack by ideologues of one flavor or another which only compounds the issue No source no inclusion is probably the best route to take