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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 ...
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.
Physiologist Ancel Keys was the lead investigator of the Minnesota Starvation Experiment. He was directly responsible for the X-ray analysis and administrative work and the general supervision of the activities in the Laboratory of Physiological Hygiene which he had founded at the University of Minnesota in 1940 after leaving positions at Harvard's Fatigue Laboratory and the Mayo Clinic.
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 aftermath of World War II saw the rise of two global superpowers, the United States (U.S.) and the Soviet Union (USSR). 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 ...
June 21–22, 1942 – Bombardment of Fort Stevens, the second attack on a U.S. military base in the continental U.S. in World War II. September 9, 1942, and September 29, 1942 – Lookout Air Raids, the only attack by enemy aircraft on the contiguous U.S. and the second enemy aircraft attack on the U.S. continent in World War II.
The Office of Scientific Research and Development (OSRD) was an agency of the United States federal government created to coordinate scientific research for military purposes during World War II. Arrangements were made for its creation during May 1941, and it was created formally by Executive Order 8807 on June 28, 1941.
Federal tax policy was highly contentious during the war, with President Franklin D. Roosevelt opposing a conservative coalition in Congress. However, both sides agreed on the need for high taxes (along with heavy borrowing) to pay for the war: top marginal tax rates ranged from 81% to 94% for the duration of the war, and the income level subject to the highest rate was lowered from $5,000,000 ...