1941

The Correlates of War project estimates this to be the deadliest year in human history in these terms of conflict deaths, placing the death toll at 3.49 million. However, the Uppsala Conflict Data Program estimates that the subsequent year, 1942, was the deadliest such year. Death toll estimates for both 1941 and 1942 range from 2.28 to 7.71 million each. Below, the events of World War II have the "WWII" prefix. January 1941 January–August – 10,072 men, women and children with mental and physical disabilities are asphyxiated with carbon monoxide in a gas chamber, at Hadamar Euthanasia Centre in Germany, in the first phase of mass killings under the Action T4 program here. January 1 – Thailand's Prime Minister Plaek Phibunsongkhram decrees January 1 as the official start of the Thai solar calendar new year (thus the previous year that began April 1 had only 9 months). January 3 – A decree (Normalschrifterlass) promulgated in Germany by Martin Bormann, on behalf of Adolf Hitler, requires replacement of blackletter typefaces by Antiqua. January 4 – The short subject Elmer's Pet Rabbit is released, marking the second appearance of Bugs Bunny, and also the first to have his name on a title card. January 5 – WWII: Battle of Bardia in Libya: Australian and British troops defeat Italian forces, the first battle of the war in which an Australian Army formation takes part. January 6 During his State of the Union address, President of the United States Franklin D. Roosevelt presents his Four Freedoms, as fundamental global human rights. The keel of battleship is laid at the New York Navy Yard in Brooklyn. January 10 – The Lend-Lease Act is introduced into the United States Congress. January 11 – WWII: The British Royal Navy light cruiser is bombed, catches fire and has to be sunk off Malta, with the loss of 81 crew. January 13 – All persons born in Puerto Rico since this day are declared U.S. citizens by birth, through U.S. federal law.