The <a href="https://en.wikipedia.org/wiki/Zollverein" id="mwRw" rel="mw:WikiLink" title="Zollverein">Zollverein</a> (German Customs Union) begins the first regular <a href="https://en.wikipedia.org/wiki/Census_in_Germany" id="mwSA" rel="mw:WikiLink" title="Census in Germany">census in Germany</a>.