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In page Wilhelmina of the Netherlands:

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Wilhelmina had a keen understanding of business matters.[citation needed] She used her personal wealth inherited from her family to make several investments in the United States, which eventually made her the world's richest woman and first female billionaire in dollars. During the 1920s and 1930s, the Netherlands began to emerge as an industrial power with the help of the Queen's funds. Engineers reclaimed vast amounts of land that had been under water by building the Zuiderzee Works, the largest hydraulic engineering project undertaken by the Netherlands during the 20th century. Its main purposes were to improve flood protection and create additional land for agriculture.