1818 – US Medical Corps forms.
1828 – First American Dictionary: its author Noah Webster registers its copyright for publication.
1863 – William Bullock patents continuous-roll printing press.
1865 – US President Abraham Lincoln is shot by John Wilkes Booth at Ford’s Theater in Washington.
1906 – US President Theodore Roosevelt denounces “muckrakers” in US press, taken from John Bunyan’s Pilgrim’s Progress.
1918 – Douglas Campbell is 1st US ace pilot (shooting down 5th German plane)
1935 – Black Sunday: Severe sandstorm ravages the US Midwest, creating the “Dust Bowl”
1939 – John Steinbeck novel “The Grapes of Wrath” published.
1948 – NYC subway fares jump from 5 cents to 10 cents.
1956 – Ampex Corp demonstrates 1st commercial videotape recorder.
1960 – “Bye Bye Birdie” opens at Martin Beck Theater NYC for 607 performances.
1960 – American record company Motown, founded by Berry Gordy Jr., is incorporated as Motown Record Corporation.
1968 – 32nd Masters Golf Tournament: Bob Goalby wins, shooting a 277. Later loses Masters for signing an incorrect score card.
1971 – President Nixon ends blockade against People’s Republic of China.
1973 – Acting FBI director L Patrick Gray resigns after admitting he destroyed evidence in the Watergate scandal.
1980 – 52nd Academy Awards: “Kramer vs Kramer”, Dustin Hoffman & Sally Field win.
1983 – US President Reagan signs $165 billion Social Security rescue.
1992 – “Guys & Dolls” opens at Martin Beck Theater NYC for 1143 performances.
2002 – 66th Masters Golf Tournament: Tiger Woods becomes the third golfer to win in two consecutive years.
2017 – “The Fate of the Furious” directed by F. Gary Gray, starring Van Diesel and Dwayne Johnson opens worldwide – highest-grossing weekend at $532 million.