Celebrated the centennial of the Louisiana Purchase (delayed one year). It hosted the 1904 Olympics and introduced the world to the ice cream cone.

LINKS:
1904 - a very active historical society
Terry's 1904 World's Fair Page - an incredibly detailed site, it delves into all aspects of the fair
At the Fair - great detailed site with many photos
1904 World's Fair Virtual Tour - a wonderful photographic tour put together by Jim Crawford
Forest Park - the legacy site
1904 World's Fair - many images from the fair
Forest Park - the legacy site
Louisiana Purchase Exposition - from the University of Delaware's Progress Made Simple
The 1904 World's Fair Charitable Association
Missouri Historial Society - with exhibits about the world's fair on the site itself.
Postcards of the Louisiana Purchase Exposition