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World war II or the second world war broke out two days after Hitler and the German army had invaded Poland.
Cause of WWII
One of the foremost causes of world war II was the German invasion of Poland under the rule of Hitler.
As Germany invaded Poland, there was dissatisfaction within other countries in Europe.
Among those who were dissatisfied was Britain and France.
The British government gave Hitler an ultimatum to withdraw its troops from Poland but Hitler refused and two days later France and Britain declared war.
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