Spain becomes the first country to vote in a <a href="https://en.wikipedia.org/wiki/2005_Spanish_European_Constitution_referendum" id="mwAUA" rel="mw:WikiLink" title="2005 Spanish European Constitution referendum">referendum on ratification</a> of the <a href="https://en.wikipedia.org/wiki/Treaty_establishing_a_Constitution_for_Europe" id="mwAUE" rel="mw:WikiLink" title="Treaty establishing a Constitution for Europe">proposed Constitution</a> of the <a href="https://en.wikipedia.org/wiki/European_Union" id="mwAUI" rel="mw:WikiLink" title="European Union">European Union</a>, passing it by a substantial margin, but on a low turnout.