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In page Brussels:

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During the 20th century, the city hosted various fairs and conferences, including the Solvay Conference on Physics and on Chemistry, and three world's fairs: the Brussels International Exposition of 1910, the Brussels International Exposition of 1935 and the 1958 Brussels World's Fair (Expo 58).[1] During World War I, Brussels was an occupied city, but German troops did not cause much damage.[citation needed] During World War II, it was again occupied by German forces, and spared major damage, before it was liberated by the British Guards Armoured Division on 3 September 1944. Brussels Airport, in the suburb of Zaventem, dates from the occupation.