Following the end of World War I, the Treaty of Versailles significantly redrew national boundaries in Europe, particularly affecting Germany and its neighbors. Among the regions impacted were the areas of Schleswig, which had been contested between Germany and Denmark for centuries. In the wake of the war, it was decided that the populations in certain parts of Schleswig should be allowed to choose their national affiliation through plebiscites. The first plebiscite took place on February 10, 1920, in the northern region, while a second one occurred in the southern region later that April. The result of the plebiscite in Northern Schleswig showed a decisive preference for integration with Denmark, as many residents identified culturally and linguistically as Danish, despite being governed by Germany during the preceding years. Based on these results, the transfer of the territory was officially enacted on June 15, 1920, solidifying Denmark's claims over Northern Schleswig and restoring a sense of national unity for those who identified as Danish. This transition was an important step in post-war negotiations and resolutions regarding self-determination in Europe.