62It must be observed, in relation to the wider legal background against which the contested directive was adopted, that the internal market has significantly changed since the entry into force of Directive 96/71, not least due to the successive enlargements of the European Union, in the years 2004, 2007 and 2013, the effect of which was to bring into that market the undertakings of Member States where, in general, terms and conditions of employment that diverged greatly from those prevailing in the other Member States were applicable.
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