Editing Louisiana Purchase Exposition (section)

===Transportation contributions===
'''Electric streetcar''' '''–''' North American street railways from the early 19th century were being introduced to [[History of trams#Electric trams|electric street railcars]]. An electric streetcar on a {{convert|1400|feet}} track demonstrated its speed, acceleration, and braking outside the Palace of Electricity.<ref name=":0" /> Many downtown trams today are electric.<ref name=":5" />

'''Personal automobile''' – The Palace of Transportation displayed [[Car|automobiles]] and motor cars.<ref name=":0" />{{Pn|date=July 2024}} The private automobile was revealed here.<ref name=":3" /> The automobile display contained 140 models including [[History of the automobile|ones powered by gasoline, steam, and electricity]].<ref name=":5" /> Inventor [[Lee de Forest]] demonstrated a prototype [[Vehicle audio|car radio]].<ref>{{cite web |last=Erb |first=Ernst |title=First Car radios-history and development of early Car Radios |url=https://www.radiomuseum.org/forum/first_car_radios_history_and_development_of_early_car_radios.html |archive-url=https://web.archive.org/web/20170913192315/http://www.radiomuseum.org/forum/first_car_radios_history_and_development_of_early_car_radios.html |archive-date=September 13, 2017 |access-date=February 16, 2018 |website=Radiomuseum.org}}</ref> Four years later, the [[Ford Motor Company]] began producing the affordable [[Ford Model T]].

'''Airplane''' – The 1904 World's Fair hosted the first "Airship Contest". Stationary air balloons demarcated a [[time trial]] with a minimum speed limit of {{convert|15|mph}}.<ref name=":5" />  Nobody won the $100,000 grand prize (equivalent to ${{formatprice|{{Inflation|US|100000|1904}}}} in {{inflation/year|US}}){{inflation/fn|US}}.<ref name=":5" /> The contest witnessed the first public [[Airship|dirigible]] flight in America. A [[History of St. Louis|history of aviation in St. Louis]] followed, leading to the nickname Flight City.<ref>{{Cite web|url=http://mohistory.org/exhibitions/audio/82?ctx=/exhibitions/online/82/|title=Flight City: St. Louis Takes to the Air|website=mohistory.org|publisher=Missouri History Museum|access-date=December 7, 2016|url-status=dead|archive-url=https://web.archive.org/web/20161220121621/http://mohistory.org/exhibitions/audio/82?ctx=%2Fexhibitions%2Fonline%2F82%2F|archive-date=December 20, 2016}}</ref>