It will be nothing like the 1930's & 40's - the 'US' had a large economy based upon manufacturing at the time, & managed to work it's way out of the hole.
Your economy today is primarily, consumer based, so there is not even a close comparison, to the last great depression.
This has come about due to the 'sub-prime lending bubble' going POP!!
Know your history, for those who do not are going down with the ship.
PT