1868
Events
January
- January 2 - British Expedition to Abyssinia: Robert Napier leads an expedition to free captive British officials and missionaries.
- January 3 - The 15-year-old Mutsuhito, Emperor Meiji of Japan, declares the Meiji Restoration, his own restoration to full power, under the influence of supporters from the Chōshū and Satsuma Domains, and against the supporters of the Tokugawa shogunate, triggering the Boshin War.
- January 5 - Paraguayan War: Brazilian Army commander Luís Alves de Lima e Silva, Duke of Caxias, enters Asunción, Paraguay's capital. Some days later he declares the war is over. Nevertheless, Francisco Solano López, Paraguay's president, prepares guerrillas to fight in the countryside.
- January 7 - The Arkansas constitutional convention meets in Little Rock.
- January 9 - Penal transportation from Britain to Australia ends, with arrival of the convict ship Hougoumont in Western Australia, after an 89-day voyage from England. There are 62 Fenians among the transportees.
- January 10 - Shōgun Tokugawa Yoshinobu declares the emperor's declaration "illegal", and prepares to attack Kyoto.
- January 27-31 - Battle of Toba–Fushimi: forces of the Tokugawa shogunate and the allied pro-Imperial forces of the Chōshū, Satsuma and Tosa Domains clash near Fushimi, Kyoto, ending in a decisive victory for the Imperial forces.
- February 13 - The British War Office sanctions the formation of what becomes the Army Post Office Corps.
- February 16 - In New York City, the Jolly Corks organization is renamed the Benevolent and Protective Order of Elks.
- February 19 - In the Passage of Humaitá, a Brazilian naval force succeeds in dashing past a Paraguayan fortress on the River Paraguay, considered by some the turning point in the Paraguayan War.
- February 24
- * Impeachment of Andrew Johnson: Three days after his action to dismiss United States Secretary of War Edwin M. Stanton, the United States House of Representatives votes 126–47 in favor of a resolution to impeach Andrew Johnson, President of the United States, the first of three Presidents to be impeached by the full House. Johnson is later acquitted by the United States Senate.
- * The first parade to have floats takes place at Mardi Gras in New Orleans.
- February
- *The Flying Foam massacre, a massacre of Indigenous Australians around Flying Foam Passage in Western Australia by white colonial settlers begins and lasts until May.
- *Foreign ministers meeting in Hyōgo are persuaded to recognise the restored Emperor Meiji of Japan, with promises that harbours will be open in accordance with international treaties.
- March 12
- * Alfred, Duke of Saxe-Coburg and Gotha, Duke of Edinburgh, is shot in the back in Sydney, Australia, at a fundraising event for the Sydney Sailors Home, by Irishman Henry James O'Farrell. The prince survives and quickly recovers; O'Farrell is executed on April 21, despite attempts by the prince to gain clemency for him.
- * Basutoland is proclaimed a British Protectorate, becoming independent in 1966 as Lesotho.
- March 23 - The University of California is founded in Oakland, California, when the Organic Act is signed into California law.
- March 24 - The Metropolitan Life Insurance Company is formed, in New York City.
- March 27 - The Lake Ontario Shore Railroad Company is organized in Oswego, New York.
- March -
- *French geologist Louis Lartet discovers the first identified skeletons of Cro-Magnon, the first early modern humans, at Abri de Crô-Magnon, a rock shelter at Les Eyzies, Dordogne, France.
- *The first transnational women's organization, Association internationale des femmes, is founded.
April
- April 1 - The Hampton Normal and Agricultural Institute is established in Hampton, Virginia.
- April 7 - The Charter Oath, drawn up by his councilors, is promulgated at the enthronement of the Emperor Meiji of Japan, promising deliberative assemblies and an end to feudalism.
- April 9 - Emperor Tewodros II of Ethiopia massacres at least 197 of his own people at Magdala. These are prisoners incarcerated, for the most part, for very trivial offenses, and are killed for requesting bread and water.
- April 9-13 - Battle of Magdala: A British-Indian task force under Robert Napier inflicts 700 deaths and a crushing defeat on the army of Emperor Tewodros II; the British and Indians suffer 30 wounded, two of whom subsequently die. Tewodros commits suicide and Magdala is captured, ending the British Expedition to Abyssinia.
- April 11-July - Fall of Edo: The Japanese city surrenders to Emperor Meiji. Shōgun Tokugawa Yoshinobu submits to the Emperor.
- April 29 - General William Tecumseh Sherman brokers the Treaty of Fort Laramie, between the federal government of the United States and the Plains Indians.
May
- May 10-14 - Boshin War - Battle of Utsunomiya Castle, Japan: Forces of the Emperor Meiji resist the retreating troops of the Tokugawa shogunate.
- May 16, May 26 - President Andrew Johnson is twice acquitted during his impeachment trial, by one vote in the United States Senate.
- May 26 - Fenian bomber Michael Barrett becomes the last person publicly hanged in the United Kingdom.
- May 29 - The Parliament of the United Kingdom passes the Capital Punishment Amendment Act, thus ending public hanging.
- May 30 - Memorial Day is observed in the United States for the first time.
- May 31
- * Thomas Spence declares himself president of the Republic of Manitobah in Canada; he soon alienates the locals.
- * The first popular bicycle race is held at Parc de Saint-Cloud, Paris.
- June 1 - The Treaty of Bosque Redondo is signed, allowing the Navajo to return to their lands in Arizona and New Mexico.
- June 2 - The first Trades Union Congress is held in Manchester, England.
- June 10 - Mihailo Obrenović, Prince of Serbia, is assassinated in Košutnjak, Belgrade.
- June 20 - Fort Fred Steele is established to protect what is at this time the western terminus of the Union Pacific Railway, near modern-day Sinclair, Wyoming.
- June - Tītokowaru's War breaks out in the South Taranaki District of New Zealand's North Island between the Ngāti Ruanui Māori tribe and the New Zealand Government.
File:Grand Tetons11.jpg|thumb|July 25: Wyoming Territory.July
- July 1 - The cable-operated West Side and Yonkers Patent Railway in Manhattan becomes the first elevated railway in the United States.
- July 4 - Battle of Ueno: Imperial Japanese troops defeat the Shōgitai.
- July 5 - Preacher William Booth establishes the Christian Mission, predecessor of The Salvation Army, in the East End of London.
- July 9 - The Fourteenth Amendment to the United States Constitution is ratified.
- July 18 - The Navajo people begin their long march home.
- July 25
- * Wyoming becomes a United States territory.
- * Paraguayan War: The Allies, in an amphibious operation, capture the fortress of Humaitá.
- July 27 - The United States Expatriation Act is adopted.
- July 28 - The Fourteenth Amendment to the United States Constitution is adopted, including the Citizenship Clause and the Equal Protection Clause, legally, if not actually, guaranteeing African Americans full citizenship and equal protection, and all persons in the United States due process of law.
August
- August 13 - The 8.5–9.0 Arica earthquake strikes southern Peru, with a maximum Mercalli intensity of XI, causing 25,000+ deaths and a destructive basin-wide tsunami, that affects Hawaii and New Zealand.
- August 18 - The element later named as helium is first detected in the spectrum of the Sun's chromosphere, by French astronomer Jules Janssen, during a total eclipse in Guntur, British India, but is assumed to be sodium.
- August 20 - Abergele rail disaster in Wales: An Irish Mail passenger train collides with 4 cargo trucks loaded with paraffin oil ; 33 are killed.
- August 22 - The Yangzhou riot in China targets a station of the China Inland Mission, and nearly leads to war between Britain and China.
- September 3 - Emperor Meiji of Japan announces that the name of the city of Edo is to be changed to Tokyo.
- September 7 - Tītokowaru's War: Māori leader Tītokowaru defeats a New Zealand military force at Te Ngutu o Te Manu, North Island.
- September 18 - The University of the South holds its first convocation in Sewanee, Tennessee.
- September 23 - Grito de Lares: Rebels in the town of Lares declare Puerto Rico independent; the local militia easily defeats them a week later.
- September 24 - Croatian–Hungarian Settlement is concluded, governing Croatia's political status in the Hungarian-ruled part of Austria-Hungary until 1918.
- September 28 - The Opelousas massacre, one of the bloodiest massacres of the Reconstruction era in the United States.
- September - Glorious Revolution: Queen Isabella II of Spain is effectively deposed and sent into exile; she formally abdicates on June 25, 1870.
October
- October 1 - Chulalongkorn starts to rule in Siam.
- October 6 - The City of New York grants Mount Sinai Hospital a 99-year lease for a property on Lexington Avenue and 66th Street, for the sum of $1.00.
- October 10 - Carlos Manuel de Céspedes declares a revolt against Spanish rule in Cuba, in an event known as El Grito de Yara or the Ten Years' War, initiating a war that lasts ten years.
- October 20
- *English astronomer Norman Lockyer observes and names the D3 Fraunhofer line in the solar spectrum, and concludes that it is caused by a hitherto unidentified element, which he later names helium.
- *Pedro Figueredo creates the Cuban national anthem, El Himno de Bayamo.
- October 23 - The current Japanese era name is changed to the Meiji period. The Edo period ends.
- October 25 - The Uspenski Cathedral, designed by Aleksey Gornostayev, is inaugurated in Helsinki, Finland.
- October 28 - Thomas Edison applies for his first patent, the electric vote recorder.