The General Government, formally the General Governorate for the Occupied Polish Territories, was a German zone of occupation established after the invasion of Poland by Nazi Germany, Slovakia and the Soviet Union in 1939 at the onset of World War II. The newly occupied Second Polish Republic was split into three zones: the General Government in its centre, Polish areas annexed by Nazi Germany in the west, and Polish areas annexed by the Soviet Union in the east. The territory was expanded substantially in 1941, after the German invasion of the Soviet Union, to include the new District of Galicia. The area of the Generalgouvernement roughly corresponded with the Austrian part of the Polish–Lithuanian Commonwealth after the Third Partition of Poland in 1795.