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In page History of the Netherlands:

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The 1948 elections led to a new coalition led by Labor's Willem Drees. He led four successive cabinets Drees I, Drees II, Drees III and Drees IV until 1958. His tenure in office saw four major political developments: the traumas of decolonisation, economic reconstruction, the establishment of the Dutch welfare state, and international integration and co-operation, including the formation of Benelux, the OEEC, NATO, the ECSC, and the EEC.