100 events that shifted history continued --part 3 51. Scientists patent computer chip 1959 52. Marconi sends radio signal across Atlantic. 1901 53. Sex scandal leads to impeachment of President Clinton. 1998 54. Secretary of State George Marshall proposes rebuilding plan for war ravaged Europe. 1947 55. Robert F. Kennedy assassinated. 1968 56. Senate rejection dooms League of Nations. 1920 57. Rachel Carson book, Silent Spring, helps launch environmental movement. 1962 58. The Beatles appear on Ed Sullivan. 1964 59. Voting Rights Act removes obstacles to minority voting. 1965 60. Russian Yuri Gagarin is first man in space. 1961 61. First jet airplane flight. 1941 62. U. S. troops arrive in South Vietnam; U.S. bombs North Vietnam. 1965 63. North Vietnamese forces take over Saigon, capital of South Vietnam. 1975 64. Manhattan Project begins secret work on atomic bomb; first chain reaction. 1942 65. GI Bill of Rights passed to help veterans. 1945 66. Alan Shepard is first American in space. 1961 67. Nixon faces Watergate scandal. 1973 68. San Francisco earthquake. 1906 69. United Nations established. 1945 70. Communists build Berlin Wall. 1961 71. Mohandas Gandhi leads nonviolent protests in India. 1920 72. Standard Oil loses antitrust case; monopolies lose power. 1911 73. U.S. withdraws ground troops from Vietnam. 1973 74. Allies establish NATO to counter Communist power in Easter Europe. 1949 75. Stalin forces modernization in Soviet Union; 25 million died in resulting famines. 1928