The <a href="https://en.wikipedia.org/wiki/Lateran_Treaty" id="mwvg" rel="mw:WikiLink" title="Lateran Treaty">Lateran Treaty</a> is ratified, bringing <a href="https://en.wikipedia.org/wiki/Vatican_City" id="mwvw" rel="mw:WikiLink" title="Vatican City">Vatican City</a> into existence.