The <a href="https://en.wikipedia.org/wiki/Universal_Postal_Union" id="mwhw" rel="mw:WikiLink" title="Universal Postal Union">Universal Postal Union</a> is created by the <a href="https://en.wikipedia.org/wiki/Treaty_of_Bern" id="mwiA" rel="mw:WikiLink" title="Treaty of Bern">Treaty of Bern</a>.