If you have the chance, go see the World War I Museum in Kansas City at Liberty Memorial. This was re-built a decade ago (I had a small part in its renovation and addition) and it is the offical WWI musuem for the nation.
Its history can be read here
http://www.theworldwar.org/s/110/new/index.aspx?sid=110&gid=1&pgid=1114
The rest of that site is interesting as well. I would say it is a little hot to visit Kansas City this week — it might be more fun in the fall.
A lady friend in Missouri and now this? Now I have two reasons to visit!