Where territory is occupied in the course of hostilities by an enemy's force, even if the annexation of the occupied country is proclaimed by the enemy, there can be no change of allegiance during the progress of hostilities on the part of a citizen of the occupied country ( R v Vermaak ( 1900 ) 21 NLR 204 ( South Africa )).

A natural-born subject owes allegiance wherever they may be, so that where territory is occupied in the course of hostilities by an enemy's force, even if the annexation of the occupied country is proclaimed by the enemy, there can be no change of allegiance during the progress of hostilities on the part of a citizen of the occupied country ( R v Vermaak ( 1900 ) 21 NLR 204 ( South Africa )).

* 1900 – The Battle of Elands River during the Second Boer War ends after a 13-day siege is lifted by the British.

Carnegie tried to keep this information concealed, but legal document released in 1900, during proceeding with the ex-chairman of Carnegie Steel Henry Clay Frick revealed how favorable the tariffs had been.

Due to the 13-day difference between the calendars between 1900 and 2099, 21 March corresponds, during the 21st century, to 3 April in the Gregorian Calendar.

Inscriptions found at Nippur, where extensive excavations were carried on during 1888 – 1900 by John P Peters and John Henry Haynes, under the auspices of the University of Pennsylvania, show that Enlil was the head of an extensive pantheon.

They adopted a red and white kit during the 1900 – 01 season.

On July 27, 1900, during the Boxer Rebellion in China, Kaiser Wilhelm II of Germany gave the order to act ruthlessly towards the rebels: " Mercy will not be shown, prisoners will not be taken.

Although the term is not documented until 1900, a conjectural etymology for the term is that it originated in 17th century Ireland for Protestant supporters of King William III during the Williamite War.

The Indus Valley Civilization ( IVC ) was a Bronze Age civilization ( 3300 – 1300 BCE ; mature period 2600 – 1900 BCE ) which was centred mostly in the western part of the Indian Subcontinent, considered as early form of Hinduism performed during this civilization.

* 1900 – The Battle of Spion Kop between the forces of the South African Republic and the Orange Free State and British forces during the Second Boer War resulted in a British defeat.

* 1900 – Armies of the Eight-Nation Alliance capture Tientsin during the Boxer Rebellion.

Jerusalem Day marks the 1967 reunification of Jerusalem and The Temple Mount under Jewish rule during the Six-Day War almost 1900 years after the destruction of the Second Temple in Jerusalem.

Jellicoe served as chief of staff to Vice Admiral Sir E. H. Seymour during the Seymour expedition to relieve the legations at Peking in June 1900.

Authors William Strauss and Neil Howe, well known for their generational theory, define the Lost Generation as the cohorts born from 1883 to 1900, who came of age during World War I and the roaring twenties.

The Rooseum Centre for Contemporary Art, founded in 1988 by the Swedish art collector and financier Fredrik Roos and housed in a former power station which had been built in 1900, was one of the foremost centres for contemporary art in Europe during the 1980s and 1990s.

After spending months in a sanatorium during the summer and fall of 1900, Weber and his wife travelled to Italy at the end of the year and did not return to Heidelberg until April 1902.

One of his significant finds during his first journey during 1900 – 1901 was the Taklamakan Desert oasis of Dandan Oilik where he was able to uncover a number of relics.

* 1900 – Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.

The Phillies sank back to mediocrity during the mid-1950s after the departure of the " Whiz Kids ", their competitive futility culminating in a record that still stands: in 1961, the Phillies lost 23 games in a row ( a record since 1900 ).

* 1900 – Filipino resistance fighters defeat a small American column in the Battle of Pulang Lupa, during the Philippine-American War.

In 1900 the ZAR was annexed by the United Kingdom during the Second Boer War although the official surrender of the territory only took place at the end of the war, on 31 May 1902.

Electronic interception appeared as early as 1900, during the Boer Wars.

The population expanded rapidly during the 19th century, increasing from fewer than 3, 000 people in 1807 to about 84, 000 in 1900.

* Bloody Sunday ( 1900 ), a day of high casualties in the Second Boer War, South Africa

Second Ellis Island Immigration Station, opened on December 17, 1900 ( photo 1905 )

* 1900 – Second Boer War: In South Africa, 20, 000 British troops invade the Orange Free State.

* 1900 – Second Boer War: British troops fail in their third attempt to lift the Siege of Ladysmith.

* 1900 – Second Boer War: In South Africa, British military leaders receive an unconditional notice of surrender from Boer General Piet Cronje at the Battle of Paardeberg.

* 1900 – The Second Boer War: The 118-day " Siege of Ladysmith " is lifted.

* 1900 – Second Boer War: Imperial forces suffer their worst single-day loss of life on Bloody Sunday, the first day of the Battle of Paardeberg.

Paris was the venue for the Second International Congress of Mathematicians in 1900.

Prewar ' epistemic communities ,' such as the International Association for Labour Legislation ( IALL ), founded in 1900, and political networks, such as the Socialist Second International, were a decisive factor in the institutionalization of international labour politics.

* 1900 – Second Boer War: British soldiers take Pretoria.

* 1900 – Second Boer War: Boers stop a British attempt to break the Siege of Ladysmith in the Battle of Spion Kop.

* 1900 – Second Boer War: Having already sieged the fortress at Ladysmith, Boer forces attack it, but are driven back by British defenders.

* 1900 – Second Boer War: The United Kingdom annexes the Orange Free State.

These " modernist " landmarks include the atonal ending of Arnold Schoenberg's Second String Quartet in 1908, the expressionist paintings of Wassily Kandinsky starting in 1903 and culminating with his first abstract painting and the founding of the Blue Rider group in Munich in 1911, and the rise of fauvism and the inventions of cubism from the studios of Henri Matisse, Pablo Picasso, Georges Braque and others in the years between 1900 and 1910.

* 1900 – Second Boer War: British troops relieve Mafeking.

These two states would survive until their annexation in 1900 by United Kingdom during the Second Boer War.

Second Boer War: Boers at Battle of Spion Kop | Spion Kop, 1900

The strong farmer representation in the Second Chamber of the Riksdag maintained a conservative view, but their decline after 1900 gradually ended opposition to full suffrage.

Romesh Chunder Dutt argued as early as 1900, and present-day scholars such as Amartya Sen agree, that some historic famines were a product of both uneven rainfall and British economic and administrative policies, which since 1857 had led to the seizure and conversion of local farmland to foreign-owned plantations, restrictions on internal trade, heavy taxation of Indian citizens to support British expeditions in Afghanistan ( see The Second Anglo-Afghan War ), inflationary measures that increased the price of food, and substantial exports of staple crops from India to Britain.

In 1900 John Fowler & Co. provided armoured road trains for use by the British forces in the Second Boer War.

In the 20th century, the race was run on the first Wednesday in June from 1900 until 1995 apart from: 1915 to 1918, ( during the First World War ) when it was on a Tuesday ; during the Second World War, from 1942 until 1945 the race was run on a Saturday as it was in the post war years of 1947 to 1950 and again in 1953.