The Boy in the Striped Pajamas By mbennett21 Sep 1, 1939 Germany invades Poland Period: Sep 1, 1939 to Sep 2, 1945 World War II Sep 3, 1939 Great Britain and France Declare war on Germany Apr 1, 1940 Germany conquers Norway, Belgium, Holland, and Denmark Jun 22, 1940 Germany defeats France Sep 3, 1940 US sends aid to Great Britain Sep 27, 1940 Japan joins the Axis Powers Jun 22, 1941 Germany invades the Soviet Union Dec 7, 1941 Pearl Harbor is bombed by the Japanese Dec 11, 1941 The Axis declares war on the US, and the US declares war on the Axis Sep 8, 1943 Italy surrenders to the Allies Jun 4, 1944 Rome falls to the Allies Jun 6, 1944 D-Day Aug 25, 1944 Paris is freed Feb 11, 1945 Yalta Conference Apr 6, 1945 The US drops an atomic bomb on the Japanese city of Hiroshima Apr 12, 1945 US President Franklin Roosevelt dies May 1, 1945 Hitler commits suicide May 2, 1945 Germany surrenders to the Allies Aug 9, 1945 The US drops another atomic bomb, this time on the city of Nagasaki Sep 2, 1945 Japan surrenders and the war officially ends