Since 1928 exists an institution, which decides, whether an event can be called a "world exposition". Similar as the olympic games (but not with such a regular cycle) countries and towns applies for organizing such an event.

Here it is the Paris resident Bureau des Expositions, which convokes a committee of representatives of the member states for this decisions.

The former free decision of states and towns to call an exposition a world exposition can be noticed for example in the years 1888 and 1889, when world expositions were held in 5 different states and towns.

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