June 14

• June 14, 1645
  Oliver Cromwell's army routes the King's army at Naseby, which markd the decisive turning point in the English Civil War
• June 14, 1649
  Jesuits set fire to Sainte-Marie among the Hurons in North America, abandoning the settlement created in 1639, due to Iroquois on the warpath against them
• June 14, 1667
  The Dutch fleet burn 3 ships and capture the English flagship near the River Medway during the Second Anglo-Dutch War
• June 14, 1755
  In England the first edition of Samuel Johnson's "A Dictionary of the English Language", which has 42,773 entries, is published
• June 14, 1777
  The Continental Congress in Philadelphia adopts the Stars and Stripes, created by Betsy Ross, as the national flag
• June 14, 1789
  Captain William Bligh of the HMS Bounty arrives in Timor in a small boat
• June 14, 1800
  French General Napoleon Bonaparte pushes the forces of Austria out of Italy in the Battle of Marengo
• June 14, 1822
  Charles Babbage, a young Cambridge mathematician, announces the invention of a machine capable of performing simple arithmetic calculations, which could perform up to 60 error-free calculation in 5 minutes, to the Astronomical Society
• June 14, 1834
  A process for making sandpaper is patented by Isaac Fischer, Springfield, Vermont
• June 14, 1846
  Americans in Northern California rebel against Mexican authorities in what is called the Bear Flag Revolt and proclaim the Republic of California
• June 14, 1866
  Prussia attacks Austria after disagreements over the administration of Schleswig-Holstein, starting Austro-Prussian War
• June 14, 1923
  Bulgarian Prime Minister Aleksandar Stamboliyski is brutally tortured and killed during a military coup
• June 14, 1935
  Chaco War between Bolivia and Paraguay ends with Paraguayan victory
• June 14, 1940
  Soviet Premier Josef Stalin sends an ultimatum to Lithuania, Latvia, and Estonia, making territorial demands
• June 14, 1943
  The Combined Bomber Offensive launches Operation Pointblank, a strategic bombing campaign against German industry and civilian morale
• June 14, 1982
  Argentina surrenders to Britain at Port Stanley, Falkland Islands, ending 74-day Falklands War over two British overseas territories in the South Atlantic
• June 14, 2008
  Expo 2008 is held in Zaragoza, Spain, with the topic of "Water and sustainable development"

April 20

• April 20, 121
  Marcus Aurelius, 16th Roman emperor, is born
• April 20, 1139
  Second Lateran Council, the tenth ecumenical council, opened in Rome to declare clerical marriages invalid, regulate clerical dress, and punish attacks on clerics by excommunication
• April 20, 1632
  Nicolas Antoine, a French Christian Protestant theologian converted to Judiasm, is burned at the stake
• April 20, 1653
  Oliver Cromwell dissolved the English parliament
• April 20, 1657
  English Admiral Robert Blake fights his last battle when he destroyed the Spanish fleet in Santa Cruz de Tenerife Bay
• April 20, 1769
  Ottawa Chief Pontiac is murdered by an Indian in Cahokia
• April 20, 1770
  Captain Cook arrives in New South Wales, Australia starting his exploration and mapping of Australia
• April 20, 1777
  New York adopts new constitution, written by Gouverneur Morris, as an independent state
• April 20, 1804
  Jean-Jacques Dessalines, Haitian rebel leader, commands 1804 Haiti Massacre of the French at town of Cape Francois, during which the white Haitians were practically eradicated
• April 20, 1809
  Napoleon defeat Austria in the Battle of Abensberg, Bavaria
• April 20, 1832
  US Congress passes legislation making thermal springs at Hot Springs, Arkansas, the first nationally protected area in the USA
• April 20, 1871
  The Enforcement Act of 1871, also known as the Ku Klux Klan Act, allows the President to suspend writ of habeas corpus
• April 20, 1902
  Marie and Pierre Curie isolate from a ton of pitchblende one-tenth of a gram of radium chloride
• April 20, 1919
  Polish Army captures Vilno, Lithuania during Polish-Soviet War
• April 20, 1992
  Seville's six-month Universal Exhibition opens, called Seville Expo 1992, in the city of Seville, Spain
• April 20, 1999
  Two Littleton, Colorado teenagers, Eric Harris and Dylan Klebold, open fire on their Columbine High School teachers and classmates, killing 12 students and one teacher, and then themselves
• April 20, 2006
  Iran announces a uranium enrichment deal with Russia, involving a joint uranium enrichment firm on Russian soil; nine days later Iran announces that it will not move all activity to Russia, thus leading to a de-facto termination of the deal
• April 20, 2009
  Oracle announces it will acquire Sun Microsystems for more than US$7 billion