| 1 | 1912 | - 1912: North Sea - The Sinking of the Titanic: 1,515 people lose their lives.
- 1912: UK - Parachutes Invented
- 1912: UK - Piltdown Man, the 'Missing Link,' Discovered but later revealed as a fraud
- 1912: SOS Accepted as Universal Distress Signal
- 1912: UK - Motorized movie cameras invented, and replaced hand-cranked cameras.
- 1912: UK - The first tank patented by Australian inventor De La Mole.
- 1912: USA - Clarence Crane created Life Savers candy
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| 2 | 1913 | - 1913: USA - Leo Baekeland invented a plastic laminate, known as Bakelite, and later as Formica
- 1913: Detroit, MI, USA - First assembly line introduced in Ford automobile factory
- 1913: New York, NY, USA - The Armory Show, an international display of some 1600 works of modern art, and one of the more important U.S. art exhibitions ever held, opens at the 69th-regiment armory. It arouses public curiosity, generates sensational news coverage, and helps change the direction of American art
- 1913: USA - Personal Income Tax introduced
- 1913: Washington, DC, USA - Woodrow Wilson president 1913-1921.
- 1913: UK - The crossword puzzle was invented by Arthur Wynne.
- 1913: USA - The Merck Chemical Company patented what is now known as ecstasy.
- 1913: USA - Mary Phelps Jacob invents the bra
- 1913: USA - Gideon Sundback invents the modern zipper.
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| 3 | 1914 | - 1914: UK - Battle of the Marne
- 1914: USA - Charlie Chaplin First Appeared as the Little Tramp
- 1914: UK - First Traffic Light
- 1914: Panama - Panama Canal Officially Opened
- 1914: Egypt - Britain proclaims protectorate over Egypt
- 1914: France - Stunning British casualty figures come from Loos -60,000; in on the Somme, 60,000 in one day; total for 5-month offensive - 400,000; Germans use poison gas at Ypres
- 1914: Ireland - Easter Monday Irish rebellion, Irish Volunteers (later Irish Republican Army) proclaim Irish Republic; German submarine lands Sir Roger Casement who is arrested, German ship with rifles intercepted off Irish coast, Casement executed; Sinn Fein and Ulster cannot agree on partition
- 1914: France - Passchendaele, British advance of 5 miles costs 400,000 casualties
- 1914: UK - Balfour Declaration promises Jews home in Palestine
- 1914: UK - First use of massed tanks (Battle of Cambrai)
- 1914: UK - King George V adopts Windsor as Royal Family's English surname in place of family's German name
- 1914: USA - Garrett A. Morgan invents the Morgan gas mask
- 4 Aug 1914: World War I begins and lasts until 1918, because Germany violates a treaty to respect neutrality of Belgium; Turkey enters war on Germany's side
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| 4 | 1915 | |
| 5 | 1916 | |
| 6 | 1917 | |
| 7 | 1918 | - 1918: UK - Influenza Epidemic
- 1918: Russia - Czar Nicholas II and his family are killed
- 1918: UK - Summer:Great Influenza Epidemic begins, reaches height end of year, new outbreak first quarter of 1919: England and Wales lose 150,000 (15,000 in London alone)
- 1918: UK - Final casualties for World War I - almost 1 million British Empire men killed, about 3 million maimed (744,000 killed are from UK)
- 1918: UK - Women over 30 given the vote (complete voting equality with men comes in 1928), all men over 21 (except peers, lunatics and felons) given vote
- 1918: UK - Consumer purchasing power now about 1/3 of what it was in 1914
- 1918: USA - Charles Jung invented fortune cookies.
- 1918: UK - Police strikes this year and the next
- 9 Nov 1918: Europe - Kaiser abdicates, peace signed two days later at Treaty of Versailles, ending World War I
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| 8 | 1919 | |
| 9 | 1920 | - 1920: India - Bubonic Plague strikes
- 1920: UK - League of Nations Established
- 1920: UK - Population of England/Wales - 37,887, Scotland - 4,882, N.Ireland - 1,258
- 1920: UK - Economic slump, 2,170,000 unemployed
- 1920: Palestine - Serious clashes between Jews and Arabs
- 1920: USA - US restricts immigration
- 1920: Ireland - Southern Irish parliament passes Government of Ireland Act, civil war effectively ends (until 1968)
- 1920: UK - Lloyd George sells honours in return for party contributions, partly responsible for downfall of Coalition government
- 1920: Egypt - Britain recognizes Egyptian independence
- 1920: UK - British Broadcasting Company (BBC) begins transmission of speech over air to public
- 1920: Italy - Benito Mussolini becomes fascist dictator
- 1920: UK - First football cup final at Wembley
- 1920: UK - Greyhound racing becomes popular
- 1920: UK - Radio and cinema begin growth (by 1929, 3,000 cinemas in Britain)
- 1920: UK - Convictions for drunkenness fall from 189,000 in 1913 to 53,000 in 1930
- 1920: France - Tuberculosis vaccine developed
- 1920: UK - The tommy gun patented by John T Thompson.
- 1920: USA - The Band-Aid invented by Earle Dickson
- 1920: Ireland - Irish Republican Army begins Civil War with raids on police barracks and income tax offices all over Ireland
- 1920: UK - Communist Party of Great Britain founded; affiliation with Labour Party rebuffed = schism between communism and socialism
- 1920: UK - Population of Great Britain has grown by 5 per cent, emigration overseas declines from 256,000 in 1923 (post-war peak) to 92,000 in 1930 and many return to offset those leaving; British population gravitates to south and away from depressed areas of South Wales and northern England, Greater London is now over 8 million
- Dec 1920: Ireland - New Government of Ireland Act proposes partition of Ireland into Ulster (north) and Irish Free State (south), each to have its own government
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| 10 | 1921 | |
| 11 | 1922 | |
| 12 | 1923 | |
| 13 | 1924 | |
| 14 | 1925 | |
| 15 | 1926 | |
| 16 | 1927 | |
| 17 | 1928 | |
| 18 | 1929 | |
| 19 | 1930 | |
| 20 | 1931 | - 1931: UK - Housing Act passes, provides subsidies for slum clearance
- 1931: USA - Al Capone Imprisoned for Income Tax Evasion
- 1931: UK - Auguste Piccard Reaches Stratosphere
- 1931: Rio de Janeiro, Brazil - Christ Monument Built on Hilltop
- 1931: New York, NY, USA - Empire State Building Completed
- 1931: USA - First official US National Anthem
- 1931: UK - Census shows British professional workers now number .75 million (8 per cent); up from 80,000 in 1921 Census: population: England/Wales - 39,952, Scotland - 4,842, N. Ireland - 1,243
- 1931: USA - Harold Edgerton invented stop-action photography.
- 1931: Germany - Germans Max Knott and Ernst Ruska co-invent the electron microscope.
- 24 Aug 1931: UK - Resignation of Labour government accepted by King, asks Ramsay MacDonald to form National Government (Coalition) to deal with economic crisis
- 21 Oct 1931: UK - General Election, vote for National Government overwhelming, more votes for Conservatives, Liberal party in disarray
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| 21 | 1932 | - 1932: UK - Agricultural Marketing Act passed, regulates quality of produce
- 1932: USA - Air Conditioning Invented
- 1932: Amelia Earhardt First Woman to Fly Solo Across the Atlantic
- 1932: Cambridge, UK - Scientists Split the Atom
- 1932: USA - Zippo Lighters Introduced
- 1932: Ireland - De Valera succeeds Cosgrave as Prime Minister of Irish Free State, ousts British Governor-General, abolishes senate, alters law re citizenship to distinguish Irish nationality from British, but still claims Commonwealth membership
- 1932: USA - Polaroid photography invented by Edwin Herbert Land.
- 1932: UK - Unemployment falls from 3 million to below 2 million in July 1935; production rises, but imports steady, exports decline; new industries booming - chemicals, rayon, cars, radio, cost of living falls
- Sep 1932: UK - 6-7 million living on 'dole', worse in Tyne and Tees and Welsh valleys
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| 22 | 1933 | |
| 23 | 1934 | |
| 24 | 1935 | |
| 25 | 1936 | - 1936: UK - Edward VIII, ruler of England 1936. House of Windsor (name adopted Jul 17, 1917): Eldest son of George V.
- 1936: UK - BBC starts regular TV broadcasts
- 1936: USA - Dale Carnegie Publishes How to Win Friends and Influence People
- 1936: Germany - Nazi Olympics in Berlin
- 1936: Spain - Spanish Civil War Begins. Germany and Italy help rebels against government, Soviet Union aids government, as do International Brigade with volunteers from European countries and US during period to 1939
- 1936: UK - Arabs attack Jews and British troops and police, riots, strikes, outbursts of great violence, Jews attack Arabs and British, disorder continues through beginning of World War II
- 1936: USA - Bell Labs invents the voice recognition machine.
- 1936: USA - Samuel Colt patents the Colt revolver.
- 1936: Germany - Hitler and Mussolini make Rome-Berlin Axis agreement to conduct aggression together, followed by German agreement with Japan which Italy signs later
- 20 Jan 1936: UK - Death of King George V
- 12 May 1936: UK - George VI, ruler of England 1936-1952. House of Windsor (name adopted Jul 17, 1917): 2nd son of George V, Duke of York; married Lady Elizabeth Bowes-Lyon.
- 16 Nov 1936: UK - Prime Minister Stanley Baldwin learns Edward VIII wants to marry twice-divorced Mrs.Simpson and will abdicate if necessary, public storm breaks on 2- 3 December, King abdicates on 5 December, announces 10 December, Abdication Act rushes through 11 December; Duke of York (father of Queen Elizabeth II) becomes George VI
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| 26 | 1937 | |
| 27 | 1938 | |
| 28 | 1939 | |
| 29 | 1940 | |
| 30 | 1941 | |
| 31 | 1942 | |
| 32 | 1943 | |
| 33 | 1944 | - 1944: France - D-Day landings
- 1944: France - First German V1 and V2 Rockets Fired
- 1944: Berlin, Germany - Hitler Escapes Assassination Attempt
- 1944: USA - The kidney dialysis machine invented by Willem Kolff.
- 1944: USA - Synthetic cortisone invented by Percy Lavon Julian.
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| 34 | 1945 | |
| 35 | 1946 | |
| 36 | 1947 | |
| 37 | 1948 | |
| 38 | 1949 | |
| 39 | 1950 | |
| 40 | 1951 | |
| 41 | 1952 | |
| 42 | 1953 | |
| 43 | 1954 | |
| 44 | 1955 | |
| 45 | 1956 | |
| 46 | 1957 | |
| 47 | 1958 | |
| 48 | 1959 | |
| 49 | 1960 | |
| 50 | 1961 | |
| 51 | 1962 | |
| 52 | 1963 | |
| 53 | 1964 | |
| 54 | 1965 | |
| 55 | 1966 | |
| 56 | 1967 | |
| 57 | 1968 | |
| 58 | 1969 | |
| 59 | 1970 | |
| 60 | 1971 | |
| 61 | 1972 | |
| 62 | 1973 | |
| 63 | 1974 | |
| 64 | 1975 | |
| 65 | 1976 | |
| 66 | 1977 | |
| 67 | 1978 | |
| 68 | 1979 | |
| 69 | 1980 | |
| 70 | 1981 | |
| 71 | 1982 | |
| 72 | 1983 | |
| 73 | 1984 | |
| 74 | 1985 | |
| 75 | 1986 | |
| 76 | 1987 | |
| 77 | 1988 | |
| 78 | 1989 | |
| 79 | 1990 | |
| 80 | 1991 | |
| 81 | 1992 | - 1992: Waco, TX, USA - Cult Compound in Waco, Texas Raided
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| 82 | 1993 | |
| 83 | 1994 | |
1912 - 1994 (82 years)