Map of the boundary changes after the <a href="https://en.wikipedia.org/wiki/Second_Schleswig_War" class="extiw" title="en:Second Schleswig War">Second Schleswig War</a> - without the danish-royal enclaves
<a href="//commons.wikimedia.org/wiki/User:NordNordWest" title="User:NordNordWest">NordNordWest</a>
CC BY-SA 3.0 de
<p><span class="int-own-work" lang="en">Own work</span>, using
</p>
<ul><li>Großer Atlas zur Weltgeschichte, Westermann Schulbuchverlag</li>
<li>United States National Imagery and Mapping Agency data</li></ul>