To all who are literate in the History of WW1 and WW2?

The cause of WW1 is quite straight forward as we all know. However, WW2 revolves around much complexicity. There were the meglo-maniac like Hitler, for instance. But what I what to know is did Chamberlain's policy of apeasement allow WW2 to take shape? and even though it was claimed that WW2 was inevitable, why did Chamberlain wait all the way till Hitler tried to conquer Poland, to finally go to War?