What were key points in the beginning of world war 2?

Key points at the beginning of World War II include Germany's invasion of Poland on September 1, 1939, which prompted Britain and France to declare war on Germany two days later. This invasion was facilitated by the Nazi-Soviet Non-Aggression Pact, which allowed Germany to attack Poland without fear of Soviet intervention. Additionally, the expansionist policies of totalitarian regimes in Germany, Italy, and Japan contributed to rising tensions. The failure of the League of Nations to maintain peace and the policy of appeasement towards aggressive nations further set the stage for the conflict.