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United States1922Wars
The treaty capped naval armaments among major powers, representing the era's most serious disarmament effort before rearmament resumed.
The Washington Naval Treaty, also known as the Five-Power Treaty, was signed during 1922 among the major Allies of World War I, which agreed to prevent an arms race by limiting naval construction. - summary
Switzerland1920Elections
The League of Nations held its first Assembly in Geneva, establishing the first major international collective-security organization and precedent for global governance.
The founding legends of the Goryeo royal family is a mythical account of the ancestral family of Wang Kŏn, who united the Korean Peninsula during the Later Three Kingdoms period and founded the Goryeo dynasty of Korea. - summary
United States1920Elections
The first presidential election where women voted nationwide delivered Warren G. Harding to office and marked a pivotal expansion of democratic participation.
Harding of Ohio and governor Calvin Coolidge of Massachusetts defeated the Democratic ticket of governor James M. - summary
Germany1919Elections
Germany's inaugural democratic election following imperial collapse established the Weimar Republic and represented a pivotal moment in Central European political transformation.
The First General Army was a general army of the Imperial Japanese Army, established for the defense of eastern and northern Honshū during the final stage of the Pacific War. - summary
United States1919Tech launches
RCA's creation in October 1919 centralized American wireless telegraphy and radio, establishing the modern broadcast industry.
Initially, RCA was a patent trust owned by a partnership of General Electric (GE), Westinghouse, AT&T Corporation and United Fruit Company. - summary
France1918Wars
Final decisive Allied offensive ending WWI; military campaign that broke German lines and led to armistice.
Beginning with the Battle of Amiens on the Western Front, the Allies pushed the Imperial German Army back, undoing its gains from the German spring offensive. - summary
Russia1917Elections
The only free democratic elections held in revolutionary Russia; Bolsheviks won only a quarter of seats but seized power anyway, ending parliamentary democracy.
A constituent assembly is a form of representative democracy. - summary
France1916Wars
Ten months of attritional warfare killed over 700,000 soldiers and became the symbol of France's resolve, though neither side gained meaningful ground.
According to one of the possible definitions, a battle is an occurrence of combat in warfare between opposing military units of any number or size. - summary
United Kingdom1916Wars
The largest naval battle of WWI determined maritime supremacy and shaped naval warfare doctrine for the century.
It was the largest naval battle and only full-scale clash of battleships of the war, and the outcome ensured that the Royal Navy denied the German surface fleet access to the North Sea and the Atlantic for the remaind… - summary
Russia1916Launches
The world's longest railway opened, connecting Moscow to Vladivostok and enabling Russian imperial expansion while transforming Siberian settlement and Russo-Asian geopolitics.
The Trans-Siberian Railway, historically known as the Great Siberian Route and often shortened to Transsib, is a large railway system that connects European Russia to the Russian Far East. - summary
France1914Wars
Decisive WWI engagement that halted the German advance and established the Western Front stalemate, shaping four years of industrial warfare.
The First Battle of the Marne or known in France as the Miracle on the Marne was a battle of the First World War fought from 5 to 12 September 1914. - summary
United Kingdom1912Tech launches
The alleged discovery of Piltdown Man in Sussex dominated paleoanthropology for 41 years before exposure as an elaborate hoax, reshaping scientific methodology.
Although doubts about Piltdown Man's authenticity began to be expressed almost immediately after its announcement in 1912, it was still broadly accepted for many years, and the hoax was only definitively exposed in 1953. - summary
Italy1908Disasters
The Messina earthquake and tsunami across the Strait devastated southern Italy, killing some 100,000 people in one of history's deadliest seismic events.
The magnitude—estimated between 7.1 and 7.5—lasted somewhere between 30 seconds and two minutes, depending on which account you trust. - summary
France1908Tech launches
Wilbur Wright's public demonstration of powered flight in France provided irrefutable proof of aviation's feasibility to European skeptics and accelerated development.
In 1904 the Wright brothers developed the Wright Flyer II, which made longer-duration flights including the first circle, followed in 1905 by the first truly practical fixed-wing aircraft, the Wright Flyer III. - summary
Ottoman Empire1908Revolutions
The Young Turk Revolution restored constitutional rule and challenged Ottoman autocracy, reshaping the empire's final decades and modernization trajectory.
The conflict was between the Turkish Nationalists against Allied and separatist forces over the application of Wilsonian principles, especially self-determination, in post-World War I Anatolia and eastern Thrace. - summary
Greece1906Sports
The intercalated Athens Olympics revived the ancient Games tradition and demonstrated the modern Olympic movement's growing institutional power.
The 1900 Summer Olympics, today officially known as the Games of the II Olympiad and also known as Paris 1900, were an international multi-sport event that took place in Paris, France, from 14 May to 28 October 1900. - summary
Russia1905Wars
The largest land battle of the early 20th century shattered European myths of Russian invincibility and triggered the 1905 Russian Revolution.
The major land battles of the war were fought on the Liaodong Peninsula and near Mukden in Southern Manchuria, with naval battles taking place in the Yellow Sea and the Sea of Japan. - summary
Ireland1905Launches
Arthur Griffith established Sinn Féin in Dublin as a political organization advocating Irish independence through constitutional means and cultural nationalism.
Sinn Féin is an Irish republican and democratic socialist political party active in Ireland, including both the Republic of Ireland and Northern Ireland. - summary
United States1905Tech launches
First Powered Airplane Flight Extended
But that first flight was just that—a flight, singular and brief, more proof of concept than reproducible achievement. - summary
