Cultural Geography Question...help!

At the time of "the troubles" in Northern Ireland, Alan Bernstein was walking down a side street in Belfast when he was challenged by a bunch of youths.
"Are you a Protestant or a Catholic ?" one threatened.
" I'm Jewish", said Bernstein.
"But are you a Protestant Jew or a Catholic Jew ?" came the rejoinder.

Isn't tribalism a pain !

BTW We generally don't do homework but you need to think about classifying areas of "competition" such as political power, jobs, schools, water, land etc.

Thank you. I really was wanting to know where to look for help on the question and for some reason I am stuck on this one. I know I wont go far in this world if I have other people do my homework for me lol I just was hoping for a push in a right direction I can go into.

I've noticed that people who are around others not like them re cultural characteristics sometimes change their views, either very incrementally, or once in a while swiftly, or become more adamantly who they are - which is a kind of self reinforcement when faced with others' opinions. So, I'd research phrases such as "changing views occurring within a culture" or natural changes in opinions over time - or whatever you can think of that sort of fits the cultural geography question. I am guessing there are scholarly papers on this.