What events unfolded between chamberlain's declaration of "peace for our time" and the outbreak of a world war?

The declaration of peace for our time was a statement made after the signing o the Munich Agreement, which gave Germany parts of Czechoslovakia and temporarily stopped the spread of Nazi power in Europe.

However, the Munich Agreement would not be followed by Hitler. Not even a year later, Hitler would break the promise made to Great Britain by invading Poland. This clearly went against the agreement made at Munich and was one of the most significant events that lead to the start of World War II.