This opens the scene/describes what will happen. This is best done without giving a plot overview.
the train crash caused delays to all journeys from Manchester
Geologists carried out surveys on two v-shaped vallies in wales
leaders of many different countries signed both peace treaties
there are several charities which help family adopt children
"<span> b.)proves something" The supporting text proves the text with evidence.</span>
These individuals are fighting because they have conflicting ideas. One side believes that white people are superior to every other race, while the other believes all races are equal, and not one is better than the other.
It is because of this strong disagreement that these people are at each other's throats. Add in an immense passion for your beliefs, and that can spark violence.
Hopefully, this helps! =)