Nations & bordersOur World

Countries

See how modern political communities were declared, unified, and transformed.

Subject guide · scope, chapters & sources ↗

Origin depth

Official Earth time scaleSelect an eon on the road to reveal its eras.ICS 2026/06 ↗

Cosmic Originsbefore Earth’s geological eons

c. 13.8 billion years agoUniverse

The Big Bang

The universe expands and cools from a hot, dense early state.

Oval map of small temperature differences in the cosmic microwave background. — ESA and the Planck Collaboration / NOIRLab · CC BY 4.0

Within the first few hundred million yearsEarly Universe

The first stars ignite

Gravity gathers primordial gas and the cosmic dark ages begin to lift.

Illustrated cosmic timeline marking the dark ages, first stars and galaxies. — NASA, ESA, CSA, STScI · NASA editorial media-use permission

c. 4.54 billion years agoSolar System

Earth takes shape

Rock and metal gather around the young Sun.

Dark, crusted Allende meteorite fragment. — Jon Taylor · CC BY-SA 2.0

At least 3.5 billion years agoEarth

Microbial life leaves evidence

Ancient rocks preserve traces of a living planet.

Layered Paleoarchean stromatolite specimen. — Didier Descouens · CC BY-SA 4.0

c. 2.4 billion years agoAtmosphere & oceans

Oxygen transforms the atmosphere

Microbial photosynthesis changes the chemistry of Earth.

Blue-grey banded iron-formation specimen on a museum stand. — Kjoonlee · CC BY 4.0

c. 1.8 billion years agoEarth

Complex cells diversify

Cells with internal structures establish a new branch of life.

Light-microscope view of modern Paramecium caudatum cells. — Fritzmann2002 · CC BY-SA 4.0

c. 600 million years agoGlobal oceans

Large multicellular life spreads

Complex bodies become a visible part of the fossil record.

Oval, segmented Dickinsonia fossil impression in rock. — cprevot (https://www.geodiversite.net/auteur193) · CC BY-SA 3.0

By c. 200 million years agoEarth

Early mammals live alongside dinosaurs

Small mammals and their close relatives are part of Mesozoic ecosystems.

Small Morganucodon fossil remains preserved in a reddish rock fragment. — Ghedoghedo · CC BY-SA 3.0

c. 56 million years agoAsia, Europe & North America

Early primates diversify

Small tree-dwelling primates spread through warm forests.

Small fossil remains of Teilhardina belgica in a museum display. — Ghedoghedo · CC BY-SA 3.0

c. 7 million years agoAfrica

The hominin story begins

A lineage of African apes starts following its own evolutionary path.

Side view of a cast of the Toumaï cranium. — Oryctes · CC BY-SA 3.0

c. 2.8 million years agoAfrica

Early Homo enters the fossil record

A jaw from Ethiopia preserves evidence attributed to our genus.

Two views of a fossil lower jaw and its teeth. — Brian Villmoare · CC BY 4.0

c. 300,000 years agoAfrica

Homo sapiens emerge

Our species appears within a diverse human world.

Front view of a Jebel Irhoud 1 skull cast in a museum display. — Jonathan Chen · CC BY-SA 4.0

c. 60,000–40,000 years agoGlobal

Humans journey beyond Africa

Later waves of migration expand our species’ global presence.

c. 10,000 BCEGlobal

The agricultural turn

Communities reshape land, food, and settlement.

Stone sickle displayed in a museum case. — Gary Todd · CC0

c. 3,200 BCEMiddle East

Writing records the world

Marks on clay turn memory into administration.

Clay tablet with incised administrative signs and a seal impression. — Unknown Sumerian maker; The Metropolitan Museum of Art · CC0

c. 1450 CEEurope

Print accelerates exchange

Movable type makes knowledge easier to reproduce.

An open Gutenberg Bible displayed behind glass. — Antonio Zugaldia · CC BY 2.0

1581 CEEurope

Dutch independence declared

Provinces reject the authority of Philip II.

A densely handwritten page of the 1581 Act of Abjuration. — States General of the United Provinces; scan from the Nationaal Archief · Public domain

1776 CEAmericas

United States declares independence

Thirteen colonies claim a new political future.

Printed heading and opening paragraphs of the American Declaration of Independence. — Continental Congress · Public domain

1804 CEAmericas

Haiti becomes independent

A successful slave revolution creates a new state.

A historical printed poster proclaiming Haitian independence in French. — Unknown printer; National Archives, United Kingdom · Public domain

1947 CESouth Asia

India gains independence

British rule ends amid partition.

Jawaharlal Nehru standing before Lord Mountbatten at the 1947 swearing-in ceremony. — Government of India Photo Division · Public domain

1957 CEAfrica

Ghana gains independence

A landmark for sub-Saharan decolonization.

Postage stamp bearing a Ghana independence overprint dated 1957. — British Government; scan uploaded by Philafrenzy · Public domain

1994 CEAfrica

South Africa votes together

The first universal-suffrage election ends apartheid rule.

Nelson Mandela placing his ballot into a ballot box during the 1994 election. — Paul Weinberg · CC BY-SA 3.0

Road complete

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