I don't really know if history repeats itself, but I'm constantly surprised by how the issues today are so similar to issues in the past.
While researching my current work in progress, I came across this fascinating speech by President Harding, given after World War One had ended.
There's a lot of talk in his speech about America should stand in relation to other countries, how involved we should be, etc. Very interesting stuff.
Do you ever read past presidential speeches? What kind of research are you interested in and do you think history repeats itself?