Profiting from German national resentment of World War I peace terms and international aversion to new armed conflict, Hitler began driving a new German war machine across Europe in 1939. His invasion of Poland in September 1939 was the tripwire that set off World War II, the most devastating period in the history of the Polish state. Between 1939 and 1945, 6 million people, over 15 percent of Poland's population, perished, with the uniquely cruel inclusion of mass extermination of Jews in concentration camps in Poland. Besides its human toll, the war left much of the country in ruins, inflicting indelible material and psychic scars.

Data as of October 1992