| 143041 | December 19 | Death | 2014 – Philip Bradbourn, English politician (b. 1951) |
| 143042 | December 19 | Death | 2014 – Arthur Gardner, American actor and producer (b. 1910) |
| 143043 | December 19 | Death | 2014 – Igor Rodionov, Russian general and politician, 3rd Russian Minister of Defence (b. 1936) |
| 143044 | December 19 | Death | 2014 – Dick Thornton, American-Canadian football player and coach (b. 1939) |
| 143045 | December 19 | Holiday and observance | Christian feast day:Lillian Trasher (Episcopal Church)O RadixPope Anastasius IPope Urban VDecember 19 (Eastern Orthodox liturgics) |
| 143046 | December 19 | Holiday and observance | Liberation day (Goa) |
| 143047 | December 19 | Holiday and observance | United Nations Day for South-South Cooperation (International) |
| 143048 | December 20 | Event | 69 – Vespasian, formerly a general under Nero, enters Rome to claim the title of Emperor. |
| 143049 | December 20 | Event | 217 – The papacy of Zephyrinus ends. Callixtus I is elected as the sixteenth pope, but is opposed by the theologian Hippolytus who accuses him of laxity and of being a Modalist, one who denies any distinction between the three persons of the Trinity. |
| 143050 | December 20 | Event | 1192 – Richard I of England is captured and imprisoned by Leopold V of Austria on his way home to England after signing a treaty with Saladin ending the Third Crusade. |
| 143051 | December 20 | Event | 1522 – Siege of Rhodes: Suleiman the Magnificent accepts the surrender of the surviving Knights of Rhodes, who are allowed to evacuate. They eventually settle on Malta and become known as the Knights of Malta. |
| 143052 | December 20 | Event | 1606 – The Virginia Company loads three ships with settlers and sets sail to establish Jamestown, Virginia, the first permanent English settlement in the Americas. |
| 143053 | December 20 | Event | 1803 – The Louisiana Purchase is completed at a ceremony in New Orleans. |
| 143054 | December 20 | Event | 1808 – Peninsular War: The Siege of Zaragoza begins. |
| 143055 | December 20 | Event | 1832 – HMS Clio under the command of Captain Onslow arrives at Port Egmont under orders to take possession of the Falkland Islands |
| 143056 | December 20 | Event | 1860 – South Carolina becomes the first state to attempt to secede from the United States. |
| 143057 | December 20 | Event | 1915 – World War I: The last Australian troops are evacuated from Gallipoli. |
| 143058 | December 20 | Event | 1917 – Cheka, the first Soviet secret police force, is founded. |
| 143059 | December 20 | Event | 1924 – Adolf Hitler is released from Landsberg Prison |
| 143060 | December 20 | Event | 1941 – World War II: First battle of the American Volunteer Group, better known as the "Flying Tigers" in Kunming, China. |
| 143061 | December 20 | Event | 1942 – World War II: Japanese air forces[disambiguation needed] bomb Calcutta, India. |
| 143062 | December 20 | Event | 1946 – The popular Christmas film It's a Wonderful Life is first released in New York City. |
| 143063 | December 20 | Event | 1951 – The EBR-1 in Arco, Idaho becomes the first nuclear power plant to generate electricity. The electricity powered four light bulbs. |
| 143064 | December 20 | Event | 1952 – A United States Air Force C-124 crashes and burns in Moses Lake, Washington killing 87. |
| 143065 | December 20 | Event | 1955 – Cardiff is proclaimed the capital city of Wales, United Kingdom. |
| 143066 | December 20 | Event | 1957 – The initial production version of the Boeing 707 makes its first flight. |
| 143067 | December 20 | Event | 1959 – Unknown attackers murder the Walker family in Osprey, Florida. |
| 143068 | December 20 | Event | 1960 – The National Front for the Liberation of Vietnam is formed. |
| 143069 | December 20 | Event | 1967 – A Pennsylvania Railroad Budd Metroliner exceeds 155 mph on their New York Division, also present day Amtrak's Northeast Corridor. |
| 143070 | December 20 | Event | 1968 – The Zodiac Killer kills Betty Lou Jenson and David Faraday in Vallejo, California. |