Go beyond the textbook answer of Sept 1939. Explore the complex origins of WWII - Treaty of Versailles, appeasement failures, the Nazi-Soviet Pact, invasion of Poland, and arguments for alternative start dates.
Exact dates of Nazi Germany and Soviet Union's invasion of Poland in September 1939. Includes detailed timeline, key battles like Westerplatte, Soviet betrayal, aftermath, and why this triggered WWII. Based on historical sites and expert insights.