What event led from chamberlain declaration of peace for our time and the outbreak of a world war?

The event that led from Prime Minister Neville Chamberlain's declaration of "peace for our time" in 1938 to the outbreak of World War II was Adolf Hitler's aggressive expansionist policies, particularly the invasion of Poland on September 1, 1939. Chamberlain's assurances followed the Munich Agreement, which allowed Nazi Germany to annex parts of Czechoslovakia in hopes of appeasing Hitler. However, this policy of appeasement ultimately failed, as Hitler continued his military aggression, leading Britain and France to declare war on Germany shortly after the invasion of Poland.