A global war without any one singular objective or enemy, this six year fight, lasting from 1939 to 1945, has been hailed the deadliest war in history resulting in the deaths of between 50 to 85 million. It was fuelled by Hitler's invasion of Poland in 1939 and involved more than 30 countries. There was no main front. Rather, it was comprised of European, African, and Asian subdivisions of the war. Countries continuously fell under different leadership throughout the duration of the war, resulting in mass displacement, whereby millions of individuals were left to seek new homelands due to the devastation left in its wake.