April 22

Pulitzer Prize-winning novelist Ellen Glasgow born (1873); Earth Day first celebrated in the US (1970); Photographer Ansel Adams dies (1984); President Richard Nixon dies (1994); Former NFL football player Pat Tillman killed during the war in Afghanistan (2004). 

April 21

John Adams becomes the first US vice president (1789); American author Mark Twain dies (1910); Queen Elizabeth II born (1926); Musical "Annie" debuts on Broadway (1977); Singer-songwriter Nina Simone dies (2003); Musician Prince dies (2016).

April 19

Battles of Lexington and Concord begin the American Revolutionary War (1775); Charles Darwin dies (1882); Boston Marathon held for first time (1897); Indian business mogul and billionaire Mukesh Ambani born (1957); Actress Ashley Judd born (1968); Oklahoma City bombing kills 168 (1995).

April 20

"Dracula" author Bram Stoker dies (1912); "Star Trek" actor George Takei born (1937); Columbine High School massacre kills 12 students and one teacher (1999); Danica Patrick becomes the first woman to win an IndyCar Series race, watch here (2008)

April 18

Paul Revere makes famous ride during American Revolution (1775); Yankee Stadium opens (1923); Albert Einstein dies (1955); Conan O'Brien born (1963); Dick Clark dies (2012).

April 17

Benjamin Franklin dies (1790); Bay of Pigs invasion begins in Cuba (1961); Apollo 13 returns safely to Earth (1970); Victoria Beckham born (1974); Former first lady Barbara Bush dies (2018).

April 16

Actor Charlie Chaplin born (1889); Harriet Quimby is first woman to fly across English Channel (1912); Basketball player Kareem Abdul-Jabbar born (1947); Singer-songwriter Selena Quintanilla-Pérez born (1971); 32 die, 17 injured in Virginia Tech mass shooting (2007).