This notion is based on a long history of conflict with ethnic Poles, first by the German-language and culture Prussians then by the united German state, starting with three partitions of Poland, germanization in the 19th and 20th centuries, and culminating in the Nazi Germany's invasion of Poland in 1939 and the genocide of six million Polish citizens, that ensued during the German occupation 1939–1945.
This notion is based on a long history of persecution of ethnic Poles, first by the German Prussians then by the united German state, starting with three partitions of Poland, germanization in the 19th and 20th centuries, and culminating in the Nazi Germany's invasion of Poland in 1939 and the genocide of six million Polish citizens that ensued during the German occupation 1939-1945.