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World War II [b] or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all the world's countries—including all the great powers—participated, with many investing all available economic, industrial, and scientific capabilities in pursuit of total war, blurring the distinction between military and ...
t. e. The causes of World War II have been given considerable attention by historians. The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes.
Opposition to World War II was expressed by the governments and peoples of all combatant nations to various extents. Initial reluctance for conflict in the Allied democratic nations changed to overwhelming, but not complete, support once the war had been joined. Some politicians and military leaders in the Axis powers opposed starting or ...
Substantial debate exists over the ethical, legal, and military aspects of the atomic bombings of Hiroshima and Nagasaki on 6 August and 9 August 1945 respectively at the close of World War II (1939–45). On 26 July 1945 at the Potsdam Conference, United States President Harry S. Truman, British Prime Minister Winston Churchill and President ...
The aftermath of World War II saw the rise of two superpowers, the Soviet Union (USSR) and the United States (US). The aftermath of World War II was also defined by the rising threat of nuclear warfare, the creation and implementation of the United Nations as an intergovernmental organization, and the decolonization of Asia, Oceania, South America and Africa by European and East Asian powers ...
U.S. Marine Corps with the nation's flag during the Battle of Iwo Jima. The military history of the United States during World War II covers the nation's role as one of the major Allies in their victory over the Axis Powers. The United States is generally considered to have entered the conflict with the 7 December 1941 surprise attack on Pearl ...
The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during World War II (1939–1945) to oppose the Axis powers. Its principal members by the end of 1941 were the " Big Four " – the United Kingdom, United States, Soviet Union, and China.
Stalin had agreed with the Western Allies to enter the war against Japan at the Tehran Conference in 1943 and at the Yalta Conference in February 1945 once Germany was defeated. The entry of the Soviet Union in the war against Japan along with the atomic bombings by the United States led to Japan's surrender, marking the end of World War II.