What events led to the beginning of ww2?

The beginning of World War II was primarily triggered by the aggressive expansionist policies of Nazi Germany, led by Adolf Hitler. Key events included the remilitarization of the Rhineland in 1936, the annexation of Austria (Anschluss) in 1938, and the Munich Agreement, which allowed Germany to annex the Sudetenland of Czechoslovakia. The invasion of Poland on September 1, 1939, following the signing of the Molotov-Ribbentrop Pact between Germany and the Soviet Union, prompted Britain and France to declare war on Germany, marking the official start of the conflict.