September 1, 1939

September 1, 1939, marks the beginning of World War II when Germany, led by Adolf Hitler, invaded Poland. This act of aggression prompted Britain and France to declare war on Germany two days later. The invasion was significant as it showcased the failure of appeasement policies and the rise of totalitarian regimes in Europe. This event not only escalated global tensions but also introduced widespread military conflict that would last until 1945, reshaping international relations and leading to significant historical consequences, including the Holocaust and the eventual establishment of the United Nations.