Social & demographic

At the Gran Dolina cave in the Sierra de Atapuerca near Burgos, Spain, level TD6 yielded fossils of a previously unknown human species named Homo antecessor in 1997, dated to roughly 850,000–800,000 years ago.

Oldest widely accepted fossils of Homo sapiens found at Jebel Irhoud, Morocco (~315,000 ya). Shows modern facial features but somewhat more archaic braincase.

Having occupied Europe and western Asia for hundreds of thousands of years, the Neanderthals vanished from the fossil and archaeological record around 40,000 years ago, shortly after Homo sapiens expanded across Eurasia.

Genetic evidence indicates that the ancestors of Native Americans diverged from their Siberian and East Asian relatives around 25,000 years ago and then spent thousands of years as a relatively isolated population before entering the…

In the Levant — modern Israel, Palestine, Jordan, Lebanon and Syria — the Natufian culture of the Late Epipaleolithic marked a decisive break from the mobile foraging that had defined humanity for hundreds of millennia.

At Eynan (Ain Mallaha) in the Upper Jordan Valley, Natufian foragers built one of the earliest known permanent settlements, occupied across several phases over roughly two millennia.

Around 7500 BCE, during the African Humid Period when monsoon rains transformed the eastern Sahara into seasonal savanna and lakes, Neolithic communities began settling the Nabta Playa basin in what is now southern Egypt's Nubian Desert.

On the Konya plain of central Anatolia, the East Mound of Çatalhöyük was occupied continuously for over a thousand years (c. 7100–5950 cal BCE), growing into one of the largest known Neolithic settlements, with thousands of inhabitants.

On the Kachi plain at the foot of the Bolan Pass in Baluchistan (modern Pakistan), the settlement of Mehrgarh became the earliest known farming community in the Indian subcontinent.

At a cemetery on the Black Sea coast near Varna in Bulgaria, accidentally discovered in 1972, archaeologists uncovered the oldest large assemblage of worked gold known anywhere, dated to roughly 4600–4200 BCE.

Between roughly 4100 and 3600 BCE, communities of the Cucuteni–Trypillia culture in present-day Ukraine, Moldova and Romania built some of the largest settlements on Earth at the time.

Around 4000 BCE the Neolithic 'package' — domesticated cattle, sheep and goats, cultivated wheat and barley, pottery, polished stone axes and timber houses — reached the islands of Britain and Ireland, carried across the sea by farmers…

During the Uruk period, the settlement of Uruk (biblical Erech, modern Warka) in southern Mesopotamia grew into what is widely regarded as the world's first true city.

Around 3300 BCE the Yamnaya (Pit Grave) culture coalesced across the Pontic-Caspian steppe, stretching from the eastern Carpathians and the lower Dnieper to the Ural River north of the Black and Caspian Seas.

At Mycenae in the northeastern Peloponnese, an emergent warrior elite was buried around 1600–1500 BCE in deep shaft graves later enclosed within the precinct known as Grave Circle A.

Around 1500–1300 BCE the distinctive Lapita cultural complex crystallised in the Bismarck Archipelago, off the northeast coast of New Guinea, as the easternmost frontier of the Austronesian expansion met the older populations of Near…

During the early-to-mid second millennium BCE, speakers of Indo-Aryan languages are widely held to have entered the northwestern Indian subcontinent from Central Asia, descendants of pastoralist populations originating on the Eurasian…

Around the start of the first millennium BCE, communities speaking early Bantu languages, originating in the grassland highlands along the modern Cameroon–Nigeria border, accelerated a centuries-long migration that would carry their…

The Plague of Athens was a devastating epidemic that struck the city-state of Athens in 430 BCE, during the second year of the Peloponnesian War against Sparta, with major recurrences in 429 BCE and the winter of 427/426 BCE.

In the year 2 CE, the Western Han dynasty conducted a household and population census during the reign of Emperor Ping, when the court was dominated by the regent Wang Mang.

The Antonine Plague was a devastating pandemic that swept the Roman Empire from approximately 165 to 180 CE, during the joint reign of emperors Marcus Aurelius and Lucius Verus, after whose dynasty it is named.

The emperor Caracalla issued the Constitutio Antoniniana, extending full Roman citizenship to almost all free inhabitants of the empire, with the partial exception of a group termed the dediticii.

The Plague of Cyprian was a devastating pandemic that swept the Roman Empire from approximately 249 CE, reaching Rome by 251 and persisting in waves until around 262-270 CE.

The Moche (Mochica) civilisation dominated the desert river valleys of Peru's north coast from roughly 100 to 800 CE, sustaining cities and monumental adobe pyramids — the Huaca del Sol and Huaca de la Luna — through sophisticated canal…

First appearing in Roman Egypt in 541 and reaching Constantinople in 542, the Plague of Justinian was the earliest historically documented pandemic of bubonic plague, caused by the bacterium Yersinia pestis.

Around 550 CE the great Mesoamerican metropolis of Teotihuacan, located in the Valley of Mexico northeast of present-day Mexico City, entered a sharp and irreversible decline marked by a deliberate, large-scale burning of its monumental…

Across the southern Maya lowlands of present-day Guatemala, Belize and southern Mexico, the great Classic-era city-states entered terminal decline during the 9th century.

The Zanj Rebellion was a massive slave uprising that erupted in 869 CE in the salt marshes of lower Mesopotamia near Basra, in the heartland of the Abbasid Caliphate.

Tiwanaku, the dominant highland polity of the south-central Andes near Lake Titicaca, disintegrated rapidly around 1000–1050 CE, closing the Andean Middle Horizon alongside the contemporaneous waning of the Wari state to the north.

Around 1050 CE the settlement at Cahokia, across the Mississippi River from modern St. Louis, expanded dramatically into the largest urban centre of pre-Columbian North America north of Mexico.

Beginning around 1050, the Banu Hilal and Banu Sulaym, Bedouin Arab tribal confederations from Upper Egypt with origins in the Najd and Hejaz, migrated westward in large numbers into Ifriqiya and the wider Maghreb.

The Genoese Black Sea trading colony of Kaffa (modern Feodosia) in Crimea was besieged in the 1340s by Jani Beg, khan of the Golden Horde, amid conflict with the Italian merchants.

In October 1347 Genoese ships fleeing the besieged Crimean port of Caffa carried plague to Sicily, and within three years the pandemic caused by the bacterium Yersinia pestis had reached almost every corner of Europe, the Middle East and…

In the summer of 1381 a mass uprising erupted across south-eastern England, the largest popular rebellion of medieval English history.

Following Columbus's voyages, sustained Atlantic contact set off the Columbian Exchange, a vast two-way transfer of crops, animals, peoples and pathogens between the Old and New Worlds.

Between 1524 and 1525 a vast popular uprising swept through German-speaking central Europe, the largest mass revolt before the French Revolution of 1789.

Mvemba a Nzinga, baptised Afonso I, ruled the central African Kingdom of Kongo from 1509 to 1542 and made it a Christian, literate state in correspondence with Lisbon and Rome.

The cocoliztli epidemic of 1545–1548 was a catastrophic outbreak of disease that swept through the Indigenous populations of New Spain, emerging in the central and southern Mexican Highlands near present-day Puebla and spreading from…

Between roughly 1560 and 1630 the European witch hunts entered their most lethal phase, the 'Great Hunt', during which about 60 percent of all prosecutions occurred and more than 40,000 people, the great majority women, were executed.

Quilombo dos Palmares was the largest maroon community in the Americas, a confederation of settlements in the highlands of Pernambuco and Alagoas in northeastern Brazil founded by escaped enslaved Africans around 1600.

After more than a decade of guerrilla warfare from the mountainous Cockpit Country, the Jamaican Maroons, communities of escaped enslaved Africans and their descendants, forced the British colonial government to terms.

On the night of 22 August 1791, following a clandestine vodou ceremony at Bois Caïman associated with the leader Dutty Boukman, enslaved people across the northern plain of Saint-Domingue rose in revolt, burning plantations and seizing…

Around 1804 the human population is generally estimated to have reached one billion for the first time, a milestone that marks the onset of the modern demographic transition.

Signed into law by President Andrew Jackson on 28 May 1830, the Indian Removal Act authorised the federal government to negotiate the exchange of Native American lands east of the Mississippi for territory in the west, opening the way for…

The Factory Act of 1833, passed by the Whig government, was the first effective British legislation to regulate the conditions of factory labour and a landmark response to the human costs of the new industrial system.

On 2 November 1834 the ship Atlas reached Mauritius from Calcutta carrying thirty-six Indian labourers, the pioneer cohort of what became the modern indentured labour system.

In March 1834 six agricultural labourers from the Dorset village of Tolpuddle were sentenced to seven years' transportation to penal colonies in Australia.

From 1845 to 1852 Ireland suffered the Great Famine, or An Gorta Mór, one of the most catastrophic subsistence crises of nineteenth-century Europe.

On 19 and 20 July 1848 some three hundred people gathered at the Wesleyan Chapel in Seneca Falls, New York, for the first women's rights convention in the United States.

On 3 March 1861 (19 February in the Russian Julian calendar) Tsar Alexander II issued the Emancipation Manifesto, freeing more than 23 million privately held serfs and inaugurating the most far-reaching reform of nineteenth-century Russia.

The Great Famine of 1876–1878 devastated southern and central India—chiefly the Madras and Bombay presidencies, Mysore, Hyderabad and parts of the Central Provinces—after the failure of the monsoon rains, with modern demographic estimates…

From 1885 the Congo Free State was ruled as the personal property of King Leopold II of Belgium, who exploited its people to extract ivory and, especially, wild rubber for export.

On 1 January 1892 the federal immigration station at Ellis Island, in New York Harbor, opened its doors, becoming the principal gateway for the climax of the greatest voluntary human migration in history.

In German South West Africa (present-day Namibia), German colonial rule and land seizures provoked an uprising by the Herero people under Samuel Maharero in January 1904, followed by a Nama revolt in 1905.

Beginning on 24 April 1915, when Ottoman authorities arrested and deported hundreds of Armenian intellectuals and community leaders in Constantinople, the Ottoman government carried out the systematic destruction of its Armenian population…

The Representation of the People Act 1918 granted parliamentary voting rights to women in Britain for the first time, alongside near-universal male suffrage.

The 1918–1920 influenza pandemic, caused by an H1N1 virus and commonly called the 'Spanish flu', was the deadliest pandemic of the modern era.

On 4 May 1919, around three thousand students gathered in Tiananmen Square in Beijing to protest the decision at the Paris Peace Conference to transfer Germany's former concessions in Shandong to Japan rather than return them to China.

The Nineteenth Amendment to the United States Constitution prohibited the denial of the right to vote on the basis of sex.

A man-made famine devastated the grain-growing regions of the USSR in 1932–33, striking Soviet Ukraine with particular severity.

The Nuremberg Laws were the racial statutes that transformed Nazi antisemitism from street harassment into codified state persecution.

Kristallnacht, the "Night of Broken Glass," was the state-orchestrated pogrom that turned Nazi persecution of Jews from legal exclusion into open physical violence.

The Holocaust was the systematic, state-sponsored persecution and murder of approximately six million Jews by Nazi Germany and its collaborators.

The Bengal Famine of 1943 was a catastrophic famine in the Bengal Province of British India (encompassing present-day West Bengal in India and Bangladesh) during World War II, in which an estimated 2 to 3 million people died from…

The Second World War and its immediate aftermath produced a second global wave of women's enfranchisement, exemplified by France and Japan.

The Guatemalan Revolution began on 20 October 1944, when a coalition of students, teachers, junior officers, and urban professionals overthrew the entrenched dictatorship associated with Jorge Ubico, launching a decade of democratic reform…

The 1945 Nigerian general strike was one of the largest labour actions in colonial Africa, mobilising tens of thousands of workers against British rule from 22 June to 6 August.

Mass anti-British protests swept Egypt in 1946, as students and workers demanded the complete evacuation of British troops and the unity of Egypt and Sudan.

The Pilbara strike, beginning on 1 May 1946 in the remote north-west of Western Australia, was the first organised industrial action by Aboriginal Australians since colonisation and the longest strike in the nation's history, lasting…

The Royal Indian Navy mutiny of February 1946 was a mass revolt of Indian naval ratings against British authority that hastened the end of colonial rule.

In 1948 the zoologist Alfred Kinsey and his collaborators published Sexual Behavior in the Human Male, the first volume of the so-called Kinsey Reports, followed in 1953 by a companion volume on women.

The Bogotazo was a massive urban uprising that erupted on 9 April 1948 after the assassination of the Liberal populist leader and presidential frontrunner Jorge Eliécer Gaitán in Bogotá, Colombia.

Costa Rica abolished its standing army on 1 December 1948, when junta leader José Figueres Ferrer symbolically smashed a wall of the Bellavista barracks in San José, becoming the first country in history to permanently dissolve its…

During the 1950s television spread with extraordinary speed through industrialised societies, transforming everyday life and commerce.

Launched on 26 June 1952, the Defiance Campaign against Unjust Laws was the first large-scale, multiracial civil disobedience movement against South Africa's apartheid system, jointly organised by the African National Congress and the…

Between 1955 and 1956 India's parliament passed a series of laws, collectively the Hindu Code Bills, that codified and reformed Hindu personal law and dramatically expanded the legal rights of women.

On 31 January 1956 the State Council of the People's Republic of China promulgated its Scheme of Simplified Chinese Characters, launching a sweeping language reform intended to raise mass literacy across a largely rural population.

In April 1956 large-scale human trials of the first oral contraceptive pill began in Rio Piedras, Puerto Rico, a pivotal and ethically fraught step toward a drug that would reshape women's lives worldwide.

The Asian flu pandemic of 1957 to 1958, caused by a new influenza A subtype H2N2 that emerged in Guizhou province in southern China, spread across the world within months and killed an estimated one to four million people, ranking among…

On 26 October 1958 Pan American World Airways inaugurated transatlantic jet service with the Boeing 707, flying from New York to Paris.

The Great Leap Forward was a campaign launched by Mao Zedong in 1958 to transform China rapidly from an agrarian society into an industrialised socialist economy through mass collectivisation into people's communes and decentralised…

On 9 May 1960 the US Food and Drug Administration approved Enovid, manufactured by G.D. Searle, as the first oral contraceptive, and it reached the market in June 1960.

On 21 March 1960 South African police opened fire on a crowd of several thousand unarmed Black protesters outside the police station in the township of Sharpeville, in the Transvaal.

In 1961, declared the "Year of Education," revolutionary Cuba mounted a mass campaign that cut adult illiteracy from around a quarter of the population to roughly four percent in a single year.

On 28 August 1963 more than a quarter of a million people gathered at the Lincoln Memorial in Washington, D.C., for the March on Washington for Jobs and Freedom, one of the largest political demonstrations in U.S. history to that point.

On 26 January 1963 a national referendum ratified Iran's White Revolution, a sweeping package of top-down reforms through which Shah Mohammad Reza Pahlavi sought to modernise the country and pre-empt radical upheaval.

On 27 May 1967 Australians voted overwhelmingly, by 90.77 percent, to amend their constitution in favour of Aboriginal people, one of the most emphatic referendum results in the nation's history.

The year 1968 saw a wave of interconnected protests, strikes and uprisings across the world, driven by opposition to the Vietnam War, demands for civil rights and democratic reform, and a generational rejection of established authority.

On 16 June 1976 thousands of Black schoolchildren marched through Soweto to protest a decree forcing them to learn in Afrikaans, the language many called that of the oppressor.

On 26 October 1977, Somali hospital cook Ali Maow Maalin developed a rash that made him the last person known to contract smallpox through natural transmission, a milestone in one of medicine's greatest triumphs.

In August 1980, strikes over food-price increases swept Poland, centred on the Lenin Shipyard in Gdańsk, where electrician Lech Wałęsa emerged as a leader.

The AIDS epidemic was first recognised in 1981, marking the start of a global pandemic that would kill tens of millions. On 5 June 1981 the U.S.

A catastrophic famine struck Ethiopia in the mid-1980s, killing hundreds of thousands and prompting an unprecedented global relief effort.

The World Health Organization created a dedicated Global Programme on AIDS in February 1987, mounting the first coordinated international response to a pandemic that was spreading fastest through sub-Saharan Africa and had already alarmed…

Pablo Escobar, the world's most notorious drug lord, was shot dead on a Medellín rooftop on 2 December 1993, one day after his 44th birthday, as he tried to flee across the tiles from a Colombian police unit that had tracked his cellphone…

On 4 February 2004 Harvard sophomore Mark Zuckerberg, with roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes, launched 'Thefacebook', a social networking website initially restricted to Harvard students.

On 17 September 2011 protesters inspired by a call from the Canadian anti-consumerist magazine Adbusters occupied Zuccotti Park in New York City's financial district, launching Occupy Wall Street.

On 26 June 2015 the United States Supreme Court ruled 5–4 in Obergefell v. Hodges that the Fourteenth Amendment requires every state to license marriages between same-sex couples and to recognise such marriages performed elsewhere.

During 2015 more than one million refugees and migrants crossed the Mediterranean to Europe, three to four times the previous year's total, in the continent's largest movement of displaced people since the Second World War.

In October 2017, following investigations by The New York Times and The New Yorker into sexual-abuse allegations against film producer Harvey Weinstein, the phrase 'Me Too' spread explosively across social media.

On 24 May 2019 same-sex marriage became legal in Taiwan, making it the first jurisdiction in Asia to grant marriage equality.

From 20 to 27 September 2019 the world saw the largest coordinated climate protests in history, a 'Global Week for Future' that drew an estimated 6 to 7.6 million participants across roughly 4,500 locations in more than 150 countries.

On 25 May 2020 George Floyd, a Black man, was murdered by Minneapolis police officer Derek Chauvin, who knelt on his neck for more than nine minutes; bystander video circulated worldwide.

The COVID-19 pandemic was the deadliest global disease outbreak in a century, killing an estimated seven million or more people and upending economies, health systems, and daily life worldwide.

By the early 2020s Africa's population surpassed 1.4 billion and continued to grow faster than that of any other world region, even as global population growth slowed elsewhere.