After World War II, the fascination for material progress gave way to the promotion of human progress and international dialogue. Technology was still at the centre of Expos, but not as an end in itself, as a means for human development. Expo 1958 Brussels was dedicated to "Progress and Mankind"; Expo 1962 Seattle was about "Man in the Space Age"; Expo 1967 Montreal was dedicated to "Man and his world."
By creating a peaceful discussion platform, Expos started contributing to the global dialogue and fostering cooperation, namely with Expo 1967 Montreal and Expo 1970 Osaka that facilitated the "détente" of the early 1970s during the Cold War.
At the same time, the progress of decolonisation allowed the creation of new countries that became new players of Expos. The number of participating countries increased year after year: 39 in Brussels, 62 in Montreal, 78 in Osaka, 109 in Seville 1992, 155 in Hannover 2000, 193 in Shanghai 2010. Today, Expos have become a showcase for cultural diversity based on equality and respect for all cultures.