Previously I have talked about depression era posters and Soviet propaganda posters. Thomas Hart Benton was a depression era painter and muralist from southwest Missouri. Growing up in St. Louis, I was exposed to his art from a young age. His shading brings the people in his paintings to life. He often depicts scenes of work, as suits the depression. (Both of the images in this entry can be found on Wikipedia.)
If you for some reason find yourself in Jefferson City, Missouri (unlikely), the capitol building has many of his murals. Then stop by Central Dairy, where you can get a pile of amazing ice cream for very little $. Then you have seen all there is to see in the illustrious capitol.