The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Upper_Silesia_plebiscite" id="mwdg" rel="mw:WikiLink" title="Upper Silesia plebiscite">Upper Silesia plebiscite</a>, mandated by the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Versailles_Treaty" id="mwdw" rel="mw:WikiLink" title="Versailles Treaty">Versailles Treaty</a> to determine a section of the border between <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Weimar_Germany" id="mweA" rel="mw:WikiLink" title="Weimar Germany">Weimar Germany</a> and <a href="https://en.wikipedia.org/wiki/Poland" id="mweQ" rel="mw:WikiLink" title="Poland">Poland</a>, is held.