Hitler betrayed his ally, the Soviet Union.
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Soldiers in WW1 were shell-shocked because of the horrors of war that they saw in which their brains never truly recovered from
September 1, 1939 September 3, 1939, actually.
World War II lasted from 1939 to 1945. It was the deadliest conflict in human history.
World War II Began in 1939 when Germany invaded Poland and ended in 1945
1939-1945