What was the immediate cause of World War II?
The rise of Nazism in Germany by Hitler was the main cause of World War II. Hitler’s main aim was to make Germany a major power in the whole world. In 1939, when Hitler occupied Poland, Great Britain and France declared war on Germany. So, this became the immediate cause of World War II. Final answer In September 1939, Germany invaded Poland which became the immediate cause of World War II.
