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The World's Columbian Exposition 1893 (also The Chicago World's Fair) was a world exhibition held in Chicago from May 1 to October 30, 1893, the nineteenth of its kind. The exhibition was held on the four hundredth anniversary of Columbus' discovery of America. Because the preparation time was too short, the construction work that had begun in September 1891 for the opening ceremony on October 21, 1892 was not completely finished. The official opening could therefore only take place in 1893, one year after the anniversary. Illustration from 19th century.