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How did the Greater Hamburg Ordinance of 1937 change Hamburg’s boundaries?

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The Greater Hamburg Ordinance of January 26, 1937, significantly expanded the city's territory, which had previously been constrained by a lack of available land for development.1

Through this ordinance, Hamburg incorporated several neighboring cities that had previously belonged to Prussia, specifically:

This administrative change was intended to facilitate large-scale urban planning and expansion, though these development prospects were soon interrupted by the outbreak of World War II in 1939.1