<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngo - 1893 uLewis wathola isabelo esivela ePennsylvania Forestry Commission sokuba adwebe imifanekiso engu - 50 ngemibala yamanzi yamaqabunga emithi ayemelelayo ayezokhonjiswa eWorlds Columbian Exposition eChicago. Umsebenzi kaLewis wawubhekwa njengempumelelo, wamzuzela indondo nediploma, futhi isethi yemidwebo yaphinde yaboniswa esidlangalaleni ngo-1901 Pan-American Exposition eBuffalo, eNew York, kanye ne-1904 Louisiana Purchase Exposition  <response>: eSt. Louis. 