1959January 1959 January 1 – Cuba: Fulgencio Batista flees Havana when the forces of Fidel Castro advance. January 2 – Soviet lunar probe Luna 1 is the first human-made object to attain escape velocity from Earth. It reaches the vicinity of Earth's Moon, where it was intended to crash-land, but instead becomes the first spacecraft to go into heliocentric orbit. January 3 Alaska is admitted as the 49th U.S. state. The southernmost island of the Maldives archipelago, Addu Atoll, declares its independence from the Kingdom of the Maldives, initiating the United Suvadive Republic.
1920January 1920 January 1 Polish–Soviet War in 1920: The Russian Red Army increases its troops along the Polish border from 4 divisions to 20. Kauniainen, completely surrounded by the city of Espoo, secedes from Espoo as its own market town. January 3 – The 1920 Xalapa earthquake in Mexico kills over 600 people, making it the second deadliest in the country. January 7 – Russian Civil War: The forces of Russian White Admiral Alexander Kolchak surrender in Krasnoyarsk; the Great Siberian Ice March ensues.
1940A calendar from 1940 according to the Gregorian calendar, factoring in the dates of Easter and related holidays, cannot be used again until the year 5280. Below, the events of World War II have the "WWII" prefix. January 1940 January 4 – WWII: Luftwaffe Colonel Hermann Göring assumes control of most war industries in Germany. January 6 – WWII: Winter War – General Semyon Timoshenko takes command of all Soviet forces. January 7 – WWII: Winter War: Battle of Raate Road – Outnumbered Finnish troops decisively defeat Soviet forces.
1916Below, the events of the First World War have the "WWI" prefix. January 1916 January 1 – The British Royal Army Medical Corps carries out the first successful blood transfusion, using blood that had been stored and cooled. January 9 – WWI: Gallipoli Campaign: The last British troops are evacuated from Gallipoli, as the Ottoman Empire prevails over a joint British and French operation to capture Constantinople. January 10 – WWI: Erzurum Offensive: Russia defeats the Ottoman Empire.
1930January 1930 January 15 – The Moon moves into its nearest point to Earth, called perigee, at the same time as its fullest phase of the Lunar Cycle. This is the closest moon distance at in recent history, and the next one will be on January 1, 2257, at . January 26 – The Indian National Congress declares this date as Independence Day, or as the day for Poorna Swaraj (Complete Independence). January 28 – The first patent for a field-effect transistor is granted in the United States, to Julius Edgar Lilienfeld.
1950January 1950 January 1 – The International Police Association (IPA) – the largest police organization in the world – is formed. January 5 – Sverdlovsk plane crash: Aeroflot Lisunov Li-2 crashes in a snowstorm. All 19 aboard are killed, including almost the entire national ice hockey team (VVS Moscow) of the Soviet Air Force – 11 players, as well as a team doctor and a masseur. January 6 – The UK recognizes the People's Republic of China; the Republic of China severs diplomatic relations with Britain in response.
1914This year saw the beginning of what became known as World War I, after Archduke Franz Ferdinand of Austria, heir to the Austrian throne was assassinated by Serbian nationalist Gavrilo Princip. It also saw the first airline to provide scheduled regular commercial passenger services with heavier-than-air aircraft, with the St. Petersburg–Tampa Airboat Line. January 1914 January 1 – The St. Petersburg–Tampa Airboat Line in the United States starts services between St.
1900As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 13 days until February 28 (O.S. February 15), 2100. The year 1900 also marked the Year of the Rat on the Chinese calendar. January 1900 January 2 – U.S. Secretary of State John Hay announces the Open Door Policy, to promote American trade with China. January 3 – The United States Census estimates the country's population to be about 70 million people.
1953January 1953 January 6 – The Asian Socialist Conference opens in Rangoon, Burma. January 12 – Estonian émigrés found a government-in-exile in Oslo. January 14 Marshal Josip Broz Tito is chosen President of Yugoslavia. The CIA-sponsored Robertson Panel first meets to discuss the UFO phenomenon. January 15 – Georg Dertinger, foreign minister of East Germany, is arrested for spying. January 19 – 71.1% of all television sets in the United States are tuned into I Love Lucy, to watch Lucy give birth to Little Ricky, which is more people than those who tune into Dwight Eisenhower's inauguration the next day.
1915Below, the events of World War I have the "WWI" prefix. January 1915 January – British physicist Sir Joseph Larmor publishes his observations on "The Influence of Local Atmospheric Cooling on Astronomical Refraction". January 1 WWI: British Royal Navy battleship HMS Formidable is sunk off Lyme Regis, Dorset, England, by an Imperial German Navy U-boat, with the loss of 547 crew. Battle of Broken Hill: A train ambush near Broken Hill, Australia, is carried out by two men (claiming to be in support of the Ottoman Empire) who are killed, together with four civilians.