You need to add all columns referenced in the SELECT list or in the ORDER BY into a GROUP BY clause.
Error is there because as per th rule when your using aggregate function with group by clause you have to include the columns which are in your select list.
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.