You're confusing nationalism with patriotism. The former lends itself towards xenophobia because of the shared ethno, religious, cultural heritage it focuses on.
Further, multi ethnic states mean something other than multi ethnic states in your dictionary? Given that the three mentioned are comprised of such, and that some have in the past and present splintered off along those lines (Russia after the USSR ended; British Commonwealth losing colonies since the end of WWII and NATIONALIST movements for Scotland, Wales, and Northern Ireland to separate from the UK. Even the Falklands had a referendum for such not too long ago.
You too need to look things up.
For future reference, pay attention not only to what I say, but specifically how I said it.