World War II by country They also had their own separate concentration camps, such as the Jasenovac death camp. See Northern Rhodesia, which it was called at the time. See Southern Rhodesia, which it was called at the time. World War II by country Nearly every country and territory in the world participated in World War II, with the exception of only a few nations which remained neutral. The Second World War pitted two alliances against each other, the Axis powers and the Allied powers. The leading Axis powers were Nazi Germany, the Kingdom of Italy and the Empire of Japan; while the United Kingdom,
European theatre of World War II commander-in-chief of all German forces in the country surrendered to Field Marshal Harold Alexander, the supreme commander of all Allied forces in the Mediterranean area. Fighting would, however, continue in Greece where a civil war had broke out and end on 1949 after Greek government troops aided by the US and Britain defeated the communist guerrillas supported by Marshall Tito and USSR. On 22 June 1941, Germany launched the invasion of the Soviet Union, code-named Operation Barbarossa. This invasion, the biggest in recorded history, started the bloodiest conflict in world history; the Axis–Soviet War, also known as the Eastern Front.