How did ww2 beggin?

World War II began on September 1, 1939, when Germany, led by Adolf Hitler, invaded Poland. This aggressive act followed years of rising tensions in Europe, characterized by the expansionist policies of Germany and the failure of appeasement by other nations. In response to the invasion, Britain and France declared war on Germany on September 3, 1939, marking the official start of the conflict. The war quickly escalated as more countries became involved, leading to a global conflict.