How did appeasement lead to World War II?

It allowed Germany’s aggressive behavior to continue until war broke out, because it believed no nation would resist as it continued to expand its territory.
It caused Britain and France to reduce their military forces to appease Germany, which took advantage of their lack of opposition to the point of ultimately forcing war.
It was meant to satisfy Germany’s desire for more territory and avoid war, giving Poland a false sense of security and leading to the relaxation of their border defenses.
It led to war as Germany became overconfident, believing it would continue to be unopposed as it annexed the low countries of Europe.