1955 – 1975

  • Polio Vaccine

    A study showing the Salk polio vaccine to be effective is released. Mass inoculations will follow and the disease, which has been a serious threat for generations, will virtually disappear.
  • Geneva Summit

    The first summit conference between Soviet and American leaders, along with those of France and Great Britain, begins in Geneva, Switzerland. No important agreements are forged, but the meeting eases some Cold War tensions.
  • Rosa Parks Arrested

    In Montgomery, Alabama, the Black seamstress Rosa Parks refuses to give up her seat on a city bus to a white man and is arrested. The ensuing boycott, coordinated by a young Reverend Martin Luther King, Jr., will mark an important turning point in the African-American freedom struggle.
  • Ike Reelected

    Eisenhower is elected to a second term as president.
  • Soviets Test ICBM

    Officials of the Soviet Union announced that they have launched the first intercontinental ballistic missile. The Americans will have such a weapon of their own ready for launch four months later.
  • First Nuclear Power Plant

    The first full-scale nuclear power plant begins operation in Shippingport, Pennsylvania, supplying electricity to Pittsburgh.
  • U.S. Launches Satellite

    The U.S. launches its first satellite, Explorer I, marking U.S. entry into the "space race" with the Russians.
  • U-2 Shot Down

    An American U-2 spy plane is shot down over the Soviet Union. Pilot Gary Powers survives the crash and admits spying. The incident sours U.S.-Soviet relations and dooms the Paris summit conference later in the month.