It's quite simple - you just need to apply your validation attribute to the entire model (or a child class). Then the validation attribute gets a reference to the model instead of just one property and you can perform your checks on multiple properties.
You should look at password validation for an example of how to do this.
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.