The Großdeutsches Reich (originally Deutches Reich but most commonly called the Third Reich or Nazi Germany) comprised, at its maximun extent, the current countries of Germany, Crimea, Denmark, Galicia, Luxembourg, Moldavia, Netherlands, Poland, Slovenia, Ukraine, as well as parts of Norway and northern Belgium.
The invasion of Poland, a so-called ‘defensive’ action, caused the Second Great War. In the first years of the War, the Reich invaded and annexed Denmark, southern Norway, and the Netherlands. The Reich also invaded Belgium and France, divided Belgium annexing the northern part and annexed Luxembourg. In 1942, the Reich attacked the Soviet Union, completing the invasion of Poland, and invading and annexing Ukraine and parts of Romania (divided between the Reich, Hungary and Bulgaria). Finally, in 1944, when controlling a rebellion against the friendly government in Yugoslavia, the Third Reich invaded Yugoslavia and annexed Slovenia.