In detailed terms, why do you think Turkey cannot join the EU. Also can it ever join?

The UN is involved because migration affects their member nations. In the best of times, migration between countries is seen as a balancing of economic labor resources between areas that have excess and those that have the need. The UN involvement is this process is to ensure the migrants are safe and there is an orderly process between nations.

The reality of the modern world is that flight from areas that are dangerous or experiencing life altering natural events needs some international collaboration. Look at the Syrian refugees entering Europe as one example. This is part of the UN charter.

After WW2 the UN was responsible for placing millions of refugees into new homes in Western Europe in the attempt to diffuse or kill off nationalism.

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.