I am learning design patterns. Can you help me design a factory pattern for this class?

Yes - factory pattern is the correct answer. In addition you may also check out Abstract Factory specifically for the scenario you mentioned where your some classes will have different attributes and may derive from some other base class.

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.