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President Franklin D. Roosevelt signed the executive order 9066 allowing the United States military to define areas as exclusionary zones. These zones affect the Japanese on the West Coast, and Germans and Italians primarily on the East Coast.
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On June 20, 1942, the development of the first atomic bomb was signed into agreement between the Prime Minister of Great Britain, Winston Churchill, and President Franklin D. Roosevelt in Hyde Park, New York.
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On December 2, 1942, the first nuclear chain reaction was produced at the University of Chicago in the Manhattan Project.
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On January, 15 1943 the world's largest office building, The Pentagon, was dedicated in Arlington, Virginia.
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On January, 4 1944 Ralph Bunche appointed 1st African American official in US State Department.
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On June 22, 1944 the G.I. Bill of Rights was signed into law, providing benefits to veterans.
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Franklin D. Roosevelt was sworn-in for his 4th term as U.S. President.
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On April 12, 1945 President Roosevelt died suddenly. Vice President Harry S. Truman assumes the presidency and role as commander in chief of World War II.
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President Truman gave the order for the use of the atomic bomb with the bombing of Hiroshima. Three days later, the second bomb was dropped on Nagasaki, Japan.
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On December 5, 1946 President Harry Truman established the President's Committee on Civil Rights to investigate the status of civil rights in the United States and propose measures to strengthen and protect the civil rights of American citizens.
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On April 3, 1948 President Harry Truman signed the Marshall Plan, which authorized $15 billion in aid for 16 countries.
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President Truman ordered the development of the hydrogen bomb, in response to the detonation of the Soviet Union's first atomic bomb in 1949.
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In 1951, the Twenty-second Amendment to the United States Constitution was added, limiting Presidents to two terms.
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The U.S. nuclear submarine USS Nautilus was targeted.
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On January 7, 1953 President Truman announced the United States has developed a hydrogen bomb.
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Dwight D. Eisenhower became the 34th president of the United States.
