| 146401 | December 28 | Holiday and observance | The fourth of the Twelve Days of Christmas (Western Christianity) |
| 146402 | December 29 | Event | 1170 – Thomas Becket, Archbishop of Canterbury, is assassinated inside Canterbury Cathedral by followers of King Henry II he subsequently becomes a saint and martyr in the Anglican Church and the Catholic Church. |
| 146403 | December 29 | Event | 1427 – The Ming army begins its withdraw from Hanoi, ending the Chinese domination of Đại Việt. |
| 146404 | December 29 | Event | 1508 – Portuguese forces under the command of Francisco de Almeida attack Khambhat at the Battle of Dabul. |
| 146405 | December 29 | Event | 1778 – American Revolutionary War: 3,000 British soldiers under the command of Lieutenant Colonel Archibald Campbell capture Savannah, Georgia. |
| 146406 | December 29 | Event | 1786 – French Revolution: The Assembly of Notables is convened. |
| 146407 | December 29 | Event | 1812 – The USS Constitution under the command of Captain William Bainbridge, captures the HMS Java off the coast of Brazil after a three-hour battle. |
| 146408 | December 29 | Event | 1835 – The Treaty of New Echota is signed, ceding all the lands of the Cherokee east of the Mississippi River to the United States. |
| 146409 | December 29 | Event | 1845 – In accordance with International Boundary delimitation, the United States annexes the Republic of Texas, following the manifest destiny doctrine. The Republic of Texas, which had been independent since the Texas Revolution of 1836, is thereupon adm |
| 146410 | December 29 | Event | 1851 – The first American YMCA opens in Boston, Massachusetts. |
| 146411 | December 29 | Event | 1860 – The first British seagoing ironclad warship, HMS Warrior is launched. |
| 146412 | December 29 | Event | 1876 – The Ashtabula River Railroad Disaster occurs, leaving 64 injured and 92 dead at Ashtabula, Ohio. |
| 146413 | December 29 | Event | 1890 – Wounded Knee Massacre on Pine Ridge Indian Reservation, 300 Lakota killed by the United States 7th Cavalry Regiment. |
| 146414 | December 29 | Event | 1911 – Mongolia gains independence from the Qing dynasty, enthroning 9th Jebtsundamba Khutughtu as Khagan of Mongolia. |
| 146415 | December 29 | Event | 1911 – Sun Yat-sen becomes the provisional President of the Republic of China he formally takes office on January 1, 1912. |
| 146416 | December 29 | Event | 1916 – A Portrait of the Artist as a Young Man, the first novel by James Joyce, was first published as a book by an American publishing house B. W. Huebschis after it had been serialized in The Egoist (1914–15). |
| 146417 | December 29 | Event | 1930 – Sir Muhammad Iqbal's presidential address in Allahabad introduces the two-nation theory and outlines a vision for the creation of Pakistan. |
| 146418 | December 29 | Event | 1934 – Japan renounces the Washington Naval Treaty of 1922 and the London Naval Treaty of 1930. |
| 146419 | December 29 | Event | 1937 – The Irish Free State is replaced by a new state called Ireland with the adoption of a new constitution. |
| 146420 | December 29 | Event | 1939 – First flight of the Consolidated B-24 Liberator. |
| 146421 | December 29 | Event | 1940 – World War II: In the Second Great Fire of London, the Luftwaffe fire-bombs London, England, UK, killing almost 200 civilians. |
| 146422 | December 29 | Event | 1949 – KC2XAK of Bridgeport, Connecticut becomes the first Ultra high frequency (UHF) television station to operate a daily schedule. |
| 146423 | December 29 | Event | 1959 – Physicist Richard Feynman gives a speech entitled "There's Plenty of Room at the Bottom", which is regarded as the birth of nanotechnology. |
| 146424 | December 29 | Event | 1959 – The Lisbon Metro begins operation. |
| 146425 | December 29 | Event | 1972 – An Eastern Air Lines Flight 401 (a Lockheed L-1011 TriStar) crashes on approach to Miami International Airport, Florida, killing 101. |
| 146426 | December 29 | Event | 1975 – A bomb explodes at LaGuardia Airport in New York City, killing 11 people and injuring 74. |
| 146427 | December 29 | Event | 1989 – Riots break-out after Hong Kong decides to forcibly repatriate Vietnamese refugees. |
| 146428 | December 29 | Event | 1992 – Fernando Collor de Mello, president of Brazil, tries to resign amidst corruption charges, but is then impeached. |
| 146429 | December 29 | Event | 1996 – Guatemala and leaders of Guatemalan National Revolutionary Unity sign a peace accord ending a 36-year civil war. |
| 146430 | December 29 | Event | 1997 – Hong Kong begins to kill all the nation's 1.25 million chickens to stop the spread of a potentially deadly influenza strain. |