51. American scientists patent computer chip 1959
52. Marconi transmits radio signal across Atlantic. 1901
53. Clinton impreached 1998
54. Marshall Plan 1947
55. Robert Kennedy assassinated in California 6/4-5/68
56. U.S. Senate rejects Versailles Treaty 1920
57. Rachel Carson's Silent Spring crusade 1962
58. Beatles debut on Ed Sullivan 2/9/64
59. Voting Rights Act passed 1965
60. Yuri Gagarin 1st man in space 4/12/61
61. First jet airplane takes flight 1939
62. U.S. planes bomb North Vietnam Feb. 1965
63. North Vietnamese take over Saigon. 4/30/75
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64. Manhattan Project begins 1942
65. GI Bill established to help veterans 1945
66. Shepard 1st American in space 5/5/61
67. Watergate scandal 1973-1974
68. San Francisco Earthquake 1906
69. United Nations officially established 1945
70. Communists build Berlin Wall Aug. 1961
71. Gandhi begins nonviolent India reform movement 1920
72. Standard Oil loses antitrust suit 1911
73. Last ground troops withdraw from Vietnam Jan. 1973
74. NATO established 1949
75. Stalin's forced USSR modernization 1928
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