Want to see a moving "expression of the American mind"?  Check out the U.S. Presidential Speeches Tag Cloud.  Drag the slider all the way to the left and then slowly drag it to the right to see an interesting portrayal of what was on the collective national mind over the years.  Watch the word "war" grow bigger and smaller...watch the word "Mexico" appear for the first time..."emancipation"..."Cuba"..."corporations"..."labor"..."Germans"...watch the word "unemployment" appear and grow larger and then smaller over the 1930's...