Dee ihe na-aga n'ihu maka paragraf a - Ihe ngosi Saint Louis ma ọ bụ St. Louis Expo bụ usoro nke ọrụ ugbo na teknụzụ kwa afọ nke a na-eme na St. Louis' Fairgrounds Park, site na 1850s ruo 1902. N'afọ 1904, e mere ihe ngosi ịzụ ahịa Louisiana
, bụ́ Nnukwu Ihe Nkiri Ụwa, e mere na St. Louis, Missouri. Emeghị ihe ngosi ugbo / teknụzụ kwa afọ na 1903-4, wee kwụsị mgbe World's Fair gasịrị. A na-ejikarị ihe ncheta sitere na St. Louis Expositions kwa afọ na 1904 World's Fair na ebe nrụọrụ weebụ na-ere ere.