Germany invades Poland. World War II begins.
The Holocaust took place in the broader context of World War II. On September 1, 1939, Germany invaded Poland. Over the next year, Nazi Germany and its allies conquered much of Europe.
Germany faces the United Kingdom in the Battle of Britain (1940). The Battle of Britain was a military campaign of the Second World War.
Germany and the Axis Powers attack Russia with a huge force of over four million troops.
On August 7, 1942, U.S. troops landed on Guadalcanal and Tulagi and seized control of Japanese-occupied territory for the first time.
An Allied invasion of Sicily and Italy followed, and Mussolini's government fell in July 1943, though Allied fighting against the Germans in Italy would continue until 1945.
The Battle of Normandy, which lasted from June 1944 to August 1944, resulted in the Allied liberation of Western Europe from Nazi Germany's control.
World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945.