I would use a mapping table in the database to map these Strings to an auto increment value. These mapping should then be cached in the application.
Use a cryptographic hash. MD5 would probably be sufficient and relatively fast. It will be unique enough for your set of input.
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.