1620 Pilgrims land at Plymouth Rock. 1690 Publick Occurrences published in Boston
		1741 First magazine in America is published 1776 Revolutionary War
		1830s The penny press becomes first truly mass medium
		1861-1865 American Civil War
1880 Marx introduces survey techniques in a study of French workers		1892 Thomas Edison develops the Kinetoscope
		1915 The Birth of a Nation marks start of modern movie industry 1914-1918 World War I
1927 Laswell publishes Propaganda Techniques in the World War 1920s Frankfurt School emerges		1920 KDKA in Pittsburgh gets first commercial radio license.
1929-1932 Payne Studies examine movies' impact on children 1930s-1940s Professional pollsters develop survey techniques		1930s The Great Depression 1939 TV is demonstrated at New York World's Fair
1942-1945 Hovland studies attitude change for US Army 1948 Lazarsfeld, Berelson, and Gaudet publish The People's Choice		1939-1945 World War II 1949 First commercial electronic computer is produced
1950 White publishes first gatekeeping study 1954 Berelson, Lazarsfeld, and McPhee publish Voting 1955 Breed published "Social Control in the Newsroom" 1959 Katz suggests the uses and gratification line of research		Early 1950s Rock 'n' roll begins
1970 Tichenor, Donohue, and Olien publish knowledge gap research 1971 Surgeon General issues report on TV violence's impact 1970s Carey revives community orientation of American cultural studies 1972 McCombs and Shaw begin agenda-setting research 1973 Noelle-Neumann hypothesizes the spiral of silence
		1980s CD-ROM invented 1981 IBM manufactures its first PC
		1996 Telecommunications Act