Please help with American Economic History topic.
Conduct original research on an American Economic History event that occurred between 1900 - 1960. (you cannot do the Great Depression or Prohibition) . I chose The Great Mississippi Flood of 1927, but my professor said " Your topic on the Mississippi Flood of 1927 causing state revenue to decline is fine but isn't that great of topic. I don't think anyone in the class would argue that a flood causes devastation which lowers the intake of taxes. I really want topics where we don't know the outcome."
Please help to give me some topics