In one of the databases, you can add a value to all of the primary key fields, then there will be no collisions when inserting. Just be sure that you add the same value to every affected table (if you are combining more than one), and every foreign key field referenced by any tables.
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.