About 75% of the population in Zone I votes to join <a href="https://en.wikipedia.org/wiki/Denmark" id="mwdQ" rel="mw:WikiLink" title="Denmark">Denmark</a> in the <a href="https://en.wikipedia.org/wiki/1920_Schleswig_plebiscites" id="mwdg" rel="mw:WikiLink" title="1920 Schleswig plebiscites">1920 Schleswig plebiscites</a>.