World's Fair facts for kids
A world's fair is a large exhibition of industry and culture. They are also called expositions or expos. This type of exhibition occurs since the middle of the 19th century. The Bureau of International Expositions officially takes care of them. The "Bureau of International Expositions" is usually abbreviated BIE, from the organization's name in French: Bureau International des Expositions.
List of official world expositions (BIE):
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World's Fair Facts for Kids. Kiddle Encyclopedia.