What is that force which is making stars to revolve around the so called centre of Galaxy?

Yes, the Sun is revolving around the Galactic centre. It moves under the gravitational attraction of all the billions of stars closer to the galactic centre than the Sun. At the galactic centre there is a supermassive black hole, of about four million times the mass of the Sun.

This by itself is not enough to cause the Sun to orbit the galactic centre, but is part of the graviational pull on the Sun.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.