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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 ...
World War II, or the Second World War was a global military conflict that was fought between September 1, 1939, and September 2, 1945. The war pitted two major military alliances against each other: the Allies of the United States, Soviet Union , United Kingdom, China and others against the Axis of Germany , Japan , Italy and others .
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.
Manhattan District The Trinity test of the Manhattan Project on 16 July 1945 was the first detonation of a nuclear weapon. Active 1942–1946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied invasion of France Allied invasion of ...
The Battle of the Atlantic, the longest continuous military campaign [11] [12] in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allied naval blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter ...
The cavity magnetron was the answer the U.S. was looking for, and it led to the creation of the MIT Radiation Laboratory (Rad Lab). Before the end of 1940, the Rad Lab was started at MIT, and subsequently almost all radar development in the U.S. was in centimeter-wavelength systems. MIT employed almost 4,000 people at its peak during World War II.
The Combined Bomber Offensive (CBO) was an Allied offensive of strategic bombing during World War II in Europe. The primary portion of the CBO was directed against Luftwaffe targets which were the highest priority from June 1943 to 1 April 1944. [4]
Why We Fight is a series of seven propaganda films produced by the US Department of War from 1942 to 1945, during World War II.It was originally written for American soldiers to help them understand why the United States was involved in the war, but US President Franklin Roosevelt ordered distribution for public viewing.