Locarno Treaties
After the end of World War I, the Rhineland came under Allied occupation. Under the 1919 Treaty of Versailles, the German military was forbidden from all territory west of the Rhine or within 50 km east of it. The 1925 Locarno Treaties reaffirmed the permanently-demilitarized status of the Rhineland. In 1929, German Foreign Minister Gustav Stresemann negotiated the withdrawal of the Allied forces. The last soldiers left the Rhineland in June 1930.