I'm not sure. Let me check for you!
If this is a open ended question I'd say the civil rights movement.
Answer:
We think that we are always right and it causes a lot of confusion.
Explanation:
People should start hearing each other out.
Chamberlain's do nothing policy and make-nice attitude led to the invasion of both Czechoslovakia and also Poland. Hitler was emboldened to invade both countries when Neville Chamberlain came back from a meeting with Hitler and declared there would be 'Peace in our Time". He naively believed Hitler was not interested in conquest in Europe. Following the invasion of Poland, both France and the UK finally saw the truth of Hitler and declared war on Germany.
