曾经举办过世博会的国家有:英国、法国、美国、德国、比利时、加拿大、日本、澳大利亚、西班牙、意大利、韩国、葡萄牙等。美国、英国、法国、比利时、加拿大、西班牙等国都多次举办世博会。举办次数最多的国家:美国,共计14次,也是收益最多的国家。举办次数最多的城市:法国巴黎 The countries that have held the World Expo include: Britain, France, the United States, Germany, Belgium, Canada, Japan, Australia, Spain, Italy, South Korea, Portugal and so on. The United States, Britain, France, Belgium, Canada, Spain and other countries have held many World Expo. The largest number of countries held: the United States, a total of 14 times, but also the most profitable countries. The most frequently held cities: Paris, France