| 82081 | July 20 | Event | 1189 – Richard I of England officially invested as Duke of Normandy. |
| 82082 | July 20 | Event | 1304 – Wars of Scottish Independence: Fall of Stirling Castle: King Edward I of England takes the stronghold using the War Wolf. |
| 82083 | July 20 | Event | 1402 – Ottoman-Timurid Wars: Battle of Ankara: Timur, ruler of Timurid Empire, defeats forces of the Ottoman Empire sultan Bayezid I. |
| 82084 | July 20 | Event | 1592 – During the first Japanese invasion of Korea, Japanese forces led by Toyotomi Hideyoshi captured Pyongyang, although they were ultimately unable to hold it. |
| 82085 | July 20 | Event | 1738 – Canadian explorer Pierre Gaultier de Varennes et de La Vérendrye reaches the western shore of Lake Michigan. |
| 82086 | July 20 | Event | 1799 – Tekle Giyorgis I begins his first of six reigns as Emperor of Ethiopia. |
| 82087 | July 20 | Event | 1807 – Nicéphore Niépce is awarded a patent by Napoleon for the Pyréolophore, the world's first internal combustion engine, after it successfully powered a boat upstream on the river Saône in France. |
| 82088 | July 20 | Event | 1810 – Citizens of Bogotá, New Granada declare independence from Spain. |
| 82089 | July 20 | Event | 1864 – American Civil War: Battle of Peachtree Creek: Near Atlanta, Georgia, Confederate forces led by General John Bell Hood unsuccessfully attack Union troops under General William T. Sherman. |
| 82090 | July 20 | Event | 1866 – Austro-Prussian War: Battle of Lissa: The Austrian Navy , led by Admiral Wilhelm von Tegetthoff, defeats the Italian Navy near the island of Vis in the Adriatic Sea. |
| 82091 | July 20 | Event | 1871 – British Columbia joins the confederation of Canada. |
| 82092 | July 20 | Event | 1885 – The Football Association legalizes professionalism in association football under pressure from the British Football Association. |
| 82093 | July 20 | Event | 1903 – The Ford Motor Company ships its first car. |
| 82094 | July 20 | Event | 1917 – World War I: The Corfu Declaration, which leads to the creation of the post-war Kingdom of Yugoslavia, is signed by the Yugoslav Committee and Kingdom of Serbia. |
| 82095 | July 20 | Event | 1920 – The Greek Army takes control of Silivri after Greece is awarded the city by the Paris Peace Conference by 1923 Greece effectively lost control to the Turks. |
| 82096 | July 20 | Event | 1922 – The League of Nations awards mandates of Togoland to France and Tanganyika to the United Kingdom. |
| 82097 | July 20 | Event | 1932 – In Washington, D.C., police fire tear gas on World War I veterans, part of the Bonus Expeditionary Force, who attempt to march to the White House. |
| 82098 | July 20 | Event | 1934 – Labor unrest in the U.S.: Police in Minneapolis fire upon striking truck drivers, during the Minneapolis Teamsters Strike of 1934, killing two and wounding sixty-seven. |
| 82099 | July 20 | Event | 1934 – West Coast waterfront strike: In Seattle, police fire tear gas on and club 2,000 striking longshoremen. The governor of Oregon calls out the National Guard to break a strike on the Portland docks. |
| 82100 | July 20 | Event | 1935 – Switzerland: A Royal Dutch Airlines plane en route from Milan to Frankfurt crashes into a Swiss mountain, killing thirteen. |
| 82101 | July 20 | Event | 1936 – The Montreux Convention is signed in Switzerland, authorizing Turkey to fortify the Dardanelles and Bosphorus but guaranteeing free passage to ships of all nations in peacetime. |
| 82102 | July 20 | Event | 1938 – The United States Department of Justice files suit in New York City against the motion picture industry charging violations of the Sherman Antitrust Act in regards to the studio system. The case would eventually result in a break-up of the industry |
| 82103 | July 20 | Event | 1940 – Denmark leaves the League of Nations. |
| 82104 | July 20 | Event | 1940 – California opens its first freeway, the Arroyo Seco Parkway. |
| 82105 | July 20 | Event | 1941 – Soviet leader Joseph Stalin consolidates the Commissariats of Home Affairs and National Security to form the NKVD and names Lavrentiy Beria its chief. |
| 82106 | July 20 | Event | 1944 – World War II: Adolf Hitler survives an assassination attempt led by German Army Colonel Claus von Stauffenberg. |
| 82107 | July 20 | Event | 1949 – Israel and Syria sign a truce to end their nineteen-month war. |
| 82108 | July 20 | Event | 1950 – Cold War: In Philadelphia, Harry Gold pleads guilty to spying for the Soviet Union by passing secrets from atomic scientist Klaus Fuchs. |
| 82109 | July 20 | Event | 1951 – King Abdullah I of Jordan is assassinated by a Palestinian while attending Friday prayers in Jerusalem. |
| 82110 | July 20 | Event | 1954 – Germany: Otto John, head of West Germany's secret service, defects to East Germany. |