Plebiscite
In 1933, a considerable number of political opponents of National Socialism moved to the Saar, as it was the only part of Germany that remained under foreign occupation following World War I. As a result, anti-Nazi groups agitated for the Saarland to remain under British and French occupation under a League of Nations mandate. However, as most of the region's population was German, the mandate was unpopular. A plebiscite was held in the territory on 13 January 1935.
With Adolf Hitler anxious for the propaganda advantages of the return of the Saar to Germany, Joseph Goebbels designed a concerted campaign to sway voters. The support of the local Catholic authorities for a return also helped, as did concerns about Bolshevism, against which Hitler was seen as a bulwark. With a voter participation of 98%, the result of the plebiscite was that the overwhelming majority, 90.8%, voted to re-join the German Reich, with only 8.8% wanting to retain the status quo, primarily as they did not wish to be ruled by Nazis. A third option of joining France received 0.4% of the vote.
Following the vote, Hitler announced that Germany "had no further territorial demands to make of France".
Read more about this topic: Saar (League Of Nations)