After Germany's invasion of Poland on September 1, 1939, England and France declared war on Germany after they refused to stop their offensive against Poland.
After Germany attacked England in the summer of 1940 known as the Battle of Britain, the U.S. got involved in WWII. The U.S. began making and supplying material of war to help England.
G.B. and U.S. fought against the Germans in North Africa.
Roosevelt and British Prime Minister Winston Churchill held several personal conferences. They met first off the coast of Newfoundland aboard a navy destroyer in August 1941. There they issued the Atlantic Charter, an agreement in which they outlined the goals of the war.
The U.S. does not officially enter WWII, but President Roosevelt pledged to do all he could to help England in the war.
The U.S. officially entered the war after Japan attacked its Pacific Fleet at Pearl Harbor in Hawaii.
American soldiers and other Allied Powers invaded Sicily and then coninued to the mainland of Italy. Italy was one of the Axis Powers and therefore an enemy of the Allies.
Just after midnight, the Allied assault upon Hitler’s ‘Fortress Europe’ began. The attack caught the German military by surprise. Allied deception plans convinced the Germans that an attack was unlikely at that time. More than 1,000 British bombers and other Allied troops attacked Normandy’s coastal defences.
This battle between the Germans and the Allies was a final attempt by Hitler to split up the Allied Powers and turn the war back in his favor. This attempt failed and the Allied Powers won.
Allied Powers attack Berlin, Germany where Hitler was located and had set up headquarters. Hitler and his wife Eva Braun committed suicide.
General Eisenhower accepted the unconditional surrender of Nazi Germany. The surrender was officially signed on May 9, 1945 in Berlin. World War II had fimally ended with the Allied Powers victorious.
An American bomber droped the world's first atomic bomb on the city of Hiroshima in Japan. Later another atomic bomb was also dropped on Nagasaki, Japan. This resulted in the unconditional surrender of Japan which had been a strong Axis Power.