The German camps in occupied Poland during World War II were built by the Nazis between 1939 and 1945 throughout the territory of the Polish Republic, both in the areas annexed in 1939, and in the General Government formed by Nazi Germany in the central part of the country (see map). After the 1941 German attack on the Soviet Union, a much greater system of camps was established, including the world's only industrial extermination camps constructed specifically to carry out the "Final Solution to the Jewish Question".