I’m Azerbaijanian by nationality and live in Azerbaijan.In Azerbaijan we have more ethnic groups than any country in Caucasis, so you can imagine how multinational is my motherland.So, Avars, Lezghins and other ethnic groups live here,but in their identity cards is written ’ Azerbaijanian’.I think if they have been living here for a long time they are also Azerbaijanians.Also,Azeries are turks,but we say we are Azeri turks instead of ‘we are turk’ because if we say we are turks all will think we are ( for example I ) from Turkiye. So, all turkish nations are separated by names,but they are all still turks,for my opinion.
As for me, I ask people where they are from to know how to speak with my interlocutor,what his’her culture,what questions I want to ask that person and so on.
Also, I think it’s good think to say others what your nationality is, because you an give information if they’re interested in your country or want to ask you some questions.
I agree with Mba that we are humans and can live anywhere,but let see world as it is,so however we say there are no differences between nations, we are humans, but something always make things difficult.Let’s speak about reality,but I really wish things to change as Mba desires.