As long as the account existed in "recent" times. , the money is claimable. But you have a lot of history here = in "recent" times dormat accounts are turned over to the state after 3 years.
But when did this process begin? Who knows, I tried to google it but nothing popped up. The FDIC (Federal Deposit Insurance Corp) began in 1934.
Before this there was no insurance for money in the bank, so who knows what would have happened to it. Then again, you say a large sum of money - is it a large sum to me (i.e. Millions) or most the people on Y!
A (i.e. Thousands). If it's thousands it could have been eaten up with monthly fees in the 50s.
Since you don't tell the state name that money was given to the state controller office in California http://www.sco.ca.gov/upd.html go to your state controller office search there they would help you.
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.