However, relationship between two nations disappeared in 1938 after the Anschluss which Nazi Germany annexed Austria. Until 1945, relationship between Austria and Poland varied mostly throughout the relationship between Germany and Poland, which would become tense because of the German invasion of Poland, which sparked World War II. Austria shares a common language and culture with Germany and participated in the occupation of Poland. Many crimes against Poles were committed under the banner of Nazi Germany, also in the Mauthausen and Gusen concentration camps, which were located in German-controlled Austria.