Editing East Prussia (section)

=== Weimar Republic ===
[[File:East Prussia 1923-1939.svg|thumb|Inter-war East Prussia (from 1923 to 1939)]]
With the forced abdication of Emperor [[Wilhelm II, German Emperor|Wilhelm II]] in the [[German Revolution of 1918–1919]], Germany became a [[Weimar Republic|republic]]. Most of the former Prussian provinces of West Prussia and [[Province of Posen|Posen]], territories annexed by Prussia in the 18th century [[Partitions of Poland]], were ceded to the [[Second Polish Republic]] according to the [[Treaty of Versailles]]. East Prussia became an [[Enclave and exclave|exclave]], being separated from mainland Germany. The [[Klaipėda Region]] was also separated from the province. Because most of West Prussia became part of the [[Second Polish Republic]] as the [[Polish Corridor]], the formerly West Prussian [[Marienwerder (region)|Marienwerder region]] became part of East Prussia as the administrative district (''Regierungsbezirk'') of West Prussia. Also, the [[Działdowo]] district in the [[Allenstein (region)|Allenstein]] region became part of the Second Polish Republic. The [[Seedienst Ostpreußen]] (Sea Service East Prussia) was established to provide an independent transport service to East Prussia.

On 11 July 1920, amidst the backdrop of the [[Polish-Soviet War]] in which the [[Second Polish Republic]] appeared to be on the brink of defeat, the [[East Prussian plebiscite]] in eastern West Prussia and southern East Prussia was held under Allied supervision to determine if the areas should join Poland or remain in the [[Weimar Germany]] Province of East Prussia. 96.7% of the people voted to remain within Germany (97.89% in the East Prussian plebiscite district).

The [[Klaipėda Region|Klaipėda Territory]] (Memelland), a [[League of Nations mandate]] since 1920, was occupied by the [[Lithuanian Armed Forces]] in 1923 and annexed without giving the inhabitants a choice by ballot.