The job of a film director is extremely challenging which requires the person to have knowledge of almost all the fields of film production. The success or failure of a film more or less depends on the capabilities of a film director.
On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II. On September 17, Soviet troops invaded Poland from the east.
World War 2 officially started on September 1, 1939 when Germany invaded Poland and most other nations which were part of the British Empire and Commonwealth declared war on Germany. However, the question is Why World War 2 Started ?.