It's A Snowflake...shut Things!
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For more on marking an answer as the "Best Answer", please visit our FAQ.Germany invaded Poland on September 1st 1939, on the false pretext that some Poles had crossed the border and murdered some Germans in a radio outpost (I think that's what it was, but will happily stand corrected.) Great Britain and France were duty bound to declare war on Germany, because of guarantees they had given to Poland in treaties. They duly did so 2 days later. There were several underlying and contributing factors, such as the previous year's invasion of Czechoslovakia. Also, about 1 week before Germany invaded Poland, Hitler cynically did a deal with Stalin to keep the Soviets out of any conflict, until Adolf invaded the Soviet Union in July 1941.
For more about the simulated attack that gave Hitler his "excuse", see
http://en.wikipedia.org/wiki/Gleiwitz_incident
I could also be argued that the punishing reprisals placed on the Germans at the end of the first world war also helped cause the second world war.
Land was taken from them, they had to pay money to the allies, and this helped to drag down the country causing massive unemployment and rampant inflation..
This gave room for the democratic (ha!) party under Hitler to come to power on a nationalistic cause, leading to the second world war.