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The United States launched its first satellite, Explorer I, on January 31, 1957.
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Alaska becomes the 49th state of America on January 3, 1959.
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Hawaii became the 50th state of America on August 21, 1959.
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John F. Kennedy was inaugurated as the 35th president of the United States of America on January 20, 1961.
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Rev. Martin Luther King Jr. gave his "I Have A Dream" speech in Washington, D.C. on August 28, 1963.
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President Kennedy was assassinated in Dallas, Texas on November 22, 1963.
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On April 4, 1968, Rev. Martin Luther King Jr. was assassinated in Memphis, Tennessee.
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President Nixon became the first and only U.S. president to resign from office on August 9, 1974. He was succeeded by his vice president, General Ford.