Here's a few more April 19 historical events to get the almonds tingling - quite a few 'firsts' and have included some 'endings' - after all, once something ends, something else usually begins..
If some events seem irrelevant, think on it some more....
1775 American Revolution begins in Lexington, Massachusetts. The "Shot Heard Round the World" took place in Concord later that day
1782 John Adams secures Dutch Republic's recognition of the United States as an independent government and house he purchased in The Hague, Netherlands became first American embassy.
1839 Treaty of London constitutes Belgium an independent kingdom & Luxembourg a Grand Duchy
1861 Baltimore riots - 4 soldiers, 9 civilians killed
1874 Barracks on Alcatraz Island destroyed in fire
1896 Herzl's "The Jewish State" is published
1897 The Boston Marathon Began
1904 Much of Toronto destroyed by fire
1909 A convention with Turkey recognizes Bulgarian independence
1919 French assembly decides on 8 hour work day
1928 Japanese troops occupies Sjantung-schiereiland
1932 President Herbert Hoover suggests 5 day work week
1933 FDR announces US will leave gold standard
1936 First day of the Great Uprising in Palestine, anti-Jewish riots break out
1940 "Lake Shore Ltd" derails speed killing 34 near Little Falls, New York
1940 Dutch prime minister De Geer declares state of siege
1941 Bulgarian troops invade Macedonia
1943 Jews refuse to surrender the Warsaw Ghetto to SS officer Jürgen Stroop, who then orders its destruction, beginning the Warsaw Ghetto Uprising
947 French ship explodes in Texas City harbor, kills about 522
1948 American Broadcasting Company (ABC) TV network debuts
1951 General Douglas MacArthur ends his military career
1962 NASA civilian pilot Joseph A Walker takes X-15 to 46,900m
1963 Johnny Cash releases his single "Ring Of Fire" written by his future wife June Carter and Merle Kilgore
1971 Charles Manson sentenced to life in prison for the murder of Sharon Tate
1971 USSR Salyut 1 launched; 1st manned lab in orbit
1972 US performs nuclear test at Nevada Test Site
1973 USSR performs nuclear test at Eastern Kazakh/Semipalitinsk USSR
1975 India launches 1st satellite with help of USSR
1978 Yitzhak Navron elected 5th president of Israel
1982 Guinon Bluford announced as 1st African American NASA astronaut
1982 Sally Ride is named the 1st American woman astronaut
1982 USSR Salyut 7 space station put into orbit
1983 France performs nuclear test
1985 16th Space Shuttle Mission (51-D)-Discovery 4 returns to Earth
1985 USSR performs nuclear test at Eastern Kazakh/Semipalitinsk USSR
1987 USSR performs underground nuclear test
1987 The Simpsons TV Show Launched
1989 Gun turret explodes on USS Iowa, killing 47 sailors
1989 Central Park Five: Violent rape of jogger Trisha Meili in NYC's Central Park became one of the most widely publicized crimes of the 1980s. 5 men wrongfully convicted spend between 6-13 years in prison
1993 After a 51 day siege by the FBI 76 Branch Davidians die in a fire near Waco Texas (accident, suicide, tear gas are disputed causes)
1993 Fire in psychiatric institute in South Korea, kills 40
1993 South Dakota governor George Mickelson and seven others are killed when a state-owned aircraft crashed lands in Iowa.
1995 Oklahoma City bombing - a truck bomb at Alfred P. Murrah Federal Building kills 168 & injures 500
1999 The German Bundestag returns to Berlin.
2005 Cardinal Joseph Ratzinger elected Pope Benedict XVI on the second day of the Papal conclave.
2011 Fidel Castro resigns from the Communist Party of Cuba's central committee after 45 years of holding the title.
2013 Boston bombing suspects killed and captured in Boston after 4 days
2015 Boat carrying approx. 850 migrants is shipwrecked in the Mediterranean between Italian and Libya, with only 27 migrants rescued.
2018 Miguel Diaz-Canel is elected Cuba's new president after former president Raúl Castro steps down
https://www.onthisday.com/events/april/19