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Census
The 1940 census indicates a United States population of 132,164,569. This represented an increase of 7.3% since 1930, the lowest rate of increase in the 20th century. -
Pearl Harbor
The attack on Pearl Harbor, Hawaii, commences at 7:55 a.m. when Japanese fighter planes launch a surprise attack on United States soil, destroying the U.S. Pacific Fleet docked at the base. -
First Atomic Bomb
The development of the first atomic bomb is signed into agreement between the Prime Minister of Great Britain, Winston Churchill, and President Franklin D. Roosevelt in Hyde Park, New York. -
Tunisia
The United States encounters its first major defeat in the European theater of World War II at the Battle for Kasserine Pass in Tunisia. -
Veterans
The G.I. Bill of Rights is signed into law, providing benefits to veterans. -
Harry S. Truman
President Harry S. Truman gives the go-ahead for the use of the atomic bomb with the bombing of Hiroshima. Three days later, the second bomb is dropped on Nagasaki, Japan. -
Atomic Bomb
The Atomic Energy Commission is established. -
Marshall Plan
Secretary of State George C. Marshall proposes aid extension to European nations for war recovery, known as the Marshall Plan, which would lead to Congressional approval of $12 billion over the following four years. -
Executive Order 9981
Executive Order 9981, ending segregation in the United States military, is signed into effect by President Harry S. Truman. -
Korea
United States withdraws its troops from Korea.