2nd January » American Statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
5th January » Ireland named Irish leader John Redmond calls for a revolt against British rule.
6th January » Second Boer War: Having already Siege of Ladysmith sieged the fortress at Ladysmith, KwaZulu-Natal Ladysmith, Boer forces attack it, but are driven back by United Kingdom of Great Britain and Ireland British defenders.
16th January » The United States Senate accepts the Anglo-German treaty of 1899 in which the United Kingdom renounces its claims to the American Samoa named Samoan islands.
23rd January » Second Boer War: The Battle of Spion Kop between the forces of the South African Republic and the Orange Free State and United Kingdom called British forces ends in a British defeat.
24th January » Second Boer War: Boers stop a British attempt to break the Siege of Ladysmith in the Battle of Spion Kop.
29th January » The American League is organized in Philadelphia with eight founding teams.
31st January » Datu Muhammad Salleh is assassination known as assassinated in Kampung Teboh, Tambunan, ending the Mat Salleh Rebellion.
3rd February » Governor of Kentucky William Goebel dies of wound sustained in an assassination attempt three days earlier in Frankfort, Kentucky.
5th February » The United States and the United Kingdom sign a treaty for the Panama Canal.
6th February » The international arbitration court at The Hague is created when the Senate of the Netherlands ratifies an 1899 peace conference decree.
7th February » Second Boer War: United Kingdom of Great Britain and Ireland named British troops fail in their Battle of Vaal Krantz known as third attempt to lift the Siege of Ladysmith.
9th February » The Davis Cup competition is established.
14th February » Second Boer War: In South Africa, 20,000 United Kingdom of Great Britain and Ireland named British troops invade the Orange Free State.
18th February » Second Boer War: Imperial forces suffer their worst single-day loss of life on Bloody Sunday (1900) known as Bloody Sunday, the first day of the Battle of Paardeberg.
27th February » Second Boer War: In South Africa, United Kingdom or British military leaders receive an unconditional notice of surrender from Boer General Piet Cronje at the Battle of Paardeberg.
27th February » The Labour Party (UK) e.g British Labour Party is founded.
27th February » FC Bayern Munich known as Fußball-Club Bayern München is founded.
28th February » The Second Boer War: The 118-day "Siege of Ladysmith" is lifted.
7th March » The Germany German liner SS Kaiser Wilhelm der Grosse becomes the first ship to send Wireless telegraphy wireless signals to shore.
13th March » Second Boer War: United Kingdom or British forces occupy Bloemfontein, Orange Free State.
14th March » The Gold Standard Act is ratified, placing United States currency on the gold standard.
16th March » Sir Arthur Evans purchased the land around the ruins of Knossos, the largest Bronze Age List of archaeological sites sorted by country named archaeological site on Crete.
24th March » Mayor of New York City Robert Anderson Van Wyck breaks ground for a new underground "New York City Subway named Rapid Transit Railroad" that would link Manhattan and Brooklyn.
2nd April » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
5th April » Archaeologists in Knossos, Crete, discover a large cache of clay tablets with hieroglyphic writing in a script they call Linear B.
15th April » Philippine–American War: Filipinos Filipino guerrillas launch a surprise attack on U.S. infantry and begin a Siege of Catubig four-day siege of Catubig, Northern Samar Catubig, Philippines.
30th April » Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
30th April » Casey Jones dies in a train wreck in Vaughan, Mississippi, while trying to make up time on the 'Cannonball Express'.
1st May » The Scofield Mine disaster kills over 200 men in Scofield, Utah in what is to date the fifth-worst mining accident in United States history.
17th May » Second Boer War: British troops relieve Siege of Mafeking called Mafeking.
18th May » The United Kingdom proclaims a protectorate over Tonga.
23rd May » American Civil War: Sergeant William Harvey Carney is awarded the Medal of Honor for his heroism in the Assault on the Battery Wagner in 1863.
24th May » Second Boer War: The United Kingdom annexes the Orange Free State.
5th June » Second Boer War: British soldiers take Pretoria.
9th June » Birsa Munda, an important figure in the Indian independence movement, dies in a British prison under mysterious circumstances.
14th June » Territory of Hawaii called Hawaii becomes a United States territory.
14th June » The Reichstag (German Empire) called Reichstag approves a second law that allows the expansion of the German navy.
17th June » Boxer Rebellion: Eight-Nation Alliance or Allied Western and Japanese forces Battle of Dagu Forts (1900) e.g capture the Taku Forts in Tianjin, China.
18th June » Empress Dowager Longyu of China orders all foreigners killed, including foreign diplomats and their families.
20th June » Boxer Rebellion: The Imperial Chinese Army begins a Siege of the International Legations called 55-day siege of the Beijing Legation Quarter or Legation Quarter in Beijing, China.
20th June » Baron Eduard Toll, leader of the Russian polar expedition of 1900–02 known as Russian Polar Expedition of 1900, departs Saint Petersburg in Russia on the explorer ship 'Zarya (polar ship) named Zarya', never to return.
21st June » Boxer Rebellion. China formally declares war on the United States, Britain, Germany, France and Japan, as an edict issued from the Empress Dowager Cixi.
25th June » The Taoism or Taoist monk Wang Yuanlu discovers the Dunhuang manuscripts, a cache of ancient texts that are of great historical and religious significance, in the Mogao Caves of Dunhuang, China.
2nd July » The first Zeppelin flight takes place on Lake Constance near Friedrichshafen, Germany.
9th July » Queen Victoria of the United Kingdom gives Royal Assent to an Act creating Australia thus uniting separate colonies on the continent under one Government of Australia named federal government.
9th July » Boxer Rebellion: The Governor of Shanxi province in North China orders the Taiyuan Massacre named execution of 45 foreign Christian missionaries and local church members, including children.
14th July » Armies of the Eight-Nation Alliance Siege of the International Legations known as capture Tianjin known as Tientsin during the Boxer Rebellion.
19th July » The Paris Métro Line 1 e.g first line of the Paris Métro opens for operation.
27th July » Kaiser Wilhelm II, German Emperor named Wilhelm II makes a speech comparing Germans to Huns; for years afterwards, "Hun" would be a disparaging name for Germans.
29th July » In Italy, King Umberto I of Italy is assassinated by the Anarchism or anarchist Gaetano Bresci.
3rd August » The Firestone Tire and Rubber Company is founded.
14th August » The Eight-Nation Alliance occupies Beijing, China, in a campaign to end the bloody Boxer Rebellion in China.
16th August » The Battle of Elands River (1900) e.g Battle of Elands River during the Second Boer War ends after a 13-day siege is lifted by the British. The battle had begun when a force of between 2,000 and 3,000 Boers had surrounded a force of 500 Australians, Rhode
8th September » Galveston Hurricane of 1900: A powerful tropical cyclone known as hurricane hits Galveston, Texas killing about 8,000 people.
13th September » Filipino people e.g Filipino resistance fighters defeat a small American Column (formation) e.g column in the Battle of Pulang Lupa, during the Philippine–American War.
17th September » Philippine–American War: Filipino people Filipinos under Juan Cailles defeat United States Americans under Colonel (United States) Colonel Benjamin F. Cheatham at Mabitac.
25th October » The United Kingdom annexes the Transvaal Colony e.g Transvaal.
7th November » Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.
18th December » The Upper Ferntree Gully, Victoria Upper Ferntree Gully to Gembrook, Victoria Glossary of rail transport terms N Narrow-gauge (2 ft 6 in or 762 mm) Railway (now the Puffing Billy Railway) in Victoria (Australia) Victoria, Australia is opened for
19th December » Hopetoun Blunder: The first Governor-General of Australia John Hope, 1st Marquess of Linlithgow named John Hope, 7th Earl of Hopetoun, appoints Sir William Lyne premier of the new state of New South Wales, but he is unable to persuade other colonial polit
26th December » A relief crew arrives at the lighthouse on the Flannan Isles of Scotland, UK, only to find the previous crew has disappeared without a trace.