My 3 topics would be the establishment of the League of Nations, Herbert Hoover, and the KKK.
My favorite of the three would have to be Herbert Hoover or the KKK. I am really interested about to know more about Hoover and his reaction to the depression and learn more about the terms they made in spite of him. I am also interested in how the KKK was handled during these times and how big of a threat they were.