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It was a joint attack against the Republic of Poland by Nazi Germany, the Slovak Republic, and the Soviet Union; which marked the beginning of World War II. -
Two days after the attack on Poland this occurred they both declared war. -
Denmark surrenders on the day of the attack. Norway holds out until June 9. -
France and the Low Countries were conquered by the Nazis, ending land operations on the Western Front until the Normandy landings. -
The attack on Pearl Harbor was a surprise military offensive carried out by the Imperial Japanese Navy against the United States naval base at Pearl Harbor. The attack was intended to be a preventive action to prevent the intervention of the United States in the military actions of the Empire of Japan in Southeast Asia. -
China officially declares war on Japan, although a de facto state of war has existed between the two countries since the Marco Polo Bridge Incident of July 7, 1937. China also declares war on Germany and Italy -
The Manhattan Project was a program of research and development undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom and Canada. From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the U.S. Army Corps of Engineers. Nuclear physicist J. Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the bombs. -
The Second Battle of El Alamein was the turning point of the war in North Africa during World War II. The allies won against the germans. -
In the summer of 1942, the Germans took the offensive in the southern Soviet Union to take the Soviet oil fields and Stalingrad, a major industrial center. Germans had 90% of the city, but the winter turned the tide, and the Soviets launched a counterattack in which they lost over a million soldiers but won, and the Germans surrendered. -
The conquest of Sicily took a little more than a month and it led directly to the fall of Italian dictator Benito Mussolini and the surrender of the Italian government to the Allies. -
It was the military operation carried out by the Allies during World War II that culminated in the liberation of the Western European territories occupied by Nazi Germany. -
The liberation of Paris was a military battle that took place during World War II from 19 August 1944 until the German garrison surrendered the French capital on 25 August 1944. -
Harry S. Truman becomes president of the US after Roosevelts death. -
They were two nuclear attacks ordered by Harry S. Truman, president of the United States, against the Empire of Japan. The attacks were carried out on August 6 and 9, 1945 on the cities of Hiroshima and Nagasaki, respectively, which contributed, along with the Soviet-Japanese War, to the surrender of Japan and the end of World War II.