How the social division effect on the Politics? Explain with example?

Take the case of Northern Ireland that we referred to above. This region of the United Kingdom has been for many years the site of a violent and bitter ethno-political conflict. Its population is divided into two major sects of Christianity: 53 per cent are Protestants, while 44 per cent are Roman Catholics. The Catholics were represented by Nationalist parties who demanded that Northern Ireland be unified with the Republic of Ireland, a predominantly Catholic country.