A coordinating conjunction is used to combine complete sentences (Options 1, 2, and 3). A subordinating conjunction subordinates a clause, making it dependent. For example, if you take the (independent) clause "I went shopping" and put a subordinating conjunction in front of it, you will have a dependent clause.
"After I went shopping" is dependent upon something else for meaning. Subordinating conjunctions are used in Options 4 and 5. More.
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.