World War 2

The two dates most often mentioned as "the beginning of World War II" are July 7, 1937, when the "Marco Polo Bridge Incident" led to a prolonged war between Japan and China, and September 1, 1939, when Germany invaded Poland, which led Britain and France to declare war on Hitler's Nazi state in retaliation.
 When Hitler invaded Poland in September 1939, France and Britain declared war on Germany. After conquering Poland, Germany attacked France. France fell in June 1940, and soon the Nazis overran most of the rest of Europe and North Africa.World War II (WWII) was a long and bloody war that lasted for six years. Officially beginning on September 1, 1939 when Germany invaded Poland, World War II lasted until both the Germans and the Japanese had surrendered to the Allies in 1945. Find out what happened in this timeline of World War II.