Ethnicity is not a clearly defined term Oh I know. There is lots of disagreements about if subset of humanity X or Y counts as a different ethnicity (Irish Tra

Ethnicity is not a clearly defined term Oh I know. There is lots of disagreements about if subset of humanity X or Y counts as a different ethnicity (Irish Travellers are view as a separate ethnicity in UK, but not Ireland for example). However the existance of disagreements, nor a clear definition doesn't mean the word is useless.