Why the policy of appeasement helped cause world war 2?

The policy of appeasement, primarily practiced by Britain and France in the 1930s, allowed aggressive powers like Nazi Germany to expand their territories unopposed, emboldening their leaders. By conceding to Hitler's demands, such as the annexation of Austria and the Sudetenland, Western democracies underestimated his ambitions and failed to confront the growing threat. This ultimately contributed to the breakdown of diplomatic relations and the outbreak of World War II in 1939 when Germany invaded Poland. The failure to challenge aggression early on set a dangerous precedent that encouraged further expansionism.