1942-1953

  • Manhattan Project

    Manhattan Project
    At the University of Chicago, the first nuclear chain reaction is produced in the Manhattan Project, creating a fission of the Uranium U-235.
  • D-Day

    D-Day
    Allied soldiers stormed the beaches of France to begin the World War II invasion of Europe. Operation Overlord gained footing quickly, and pushed through the Atlantic Wall.
  • FDR

    FDR
    Franklin D. Roosevelt sworn-in as United States President in January 20, 1945.
  • Surrender of Germany

    Surrender of Germany
    The surrender of Germany at Reims, France end the military engagements of World War II in Europe.
  • Atomic Bomb

    Atomic Bomb
    President Harry S. Truman gives the go-ahead for the use of the atomic bomb on the Japanese city of Hiroshima and three days later on Nagasaki.
  • Hydrogen Bomb

    Hydrogen Bomb
    In response to the detonation of the Soviet Union's first atomic bomb, President Harry S. Truman orders the development of the hydrogen bomb.
  • 22nd Amendment

    22nd Amendment
    The Twenty-second Amendment to the United States Constitution is ratified which limits the President to two terms.
  • The Marshall Plan

    The Marshall Plan
    The Marshall Plan expires after distributing more than $13.3 billion USD in foreign aid for European nations.