C

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Collapse of the Western Roman Empire (5th century)
Creation of the universe (13.8 billion years ago)
Creation of writing (3,500 years ago)

D

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Development of agriculture (10,000 years ago)

E

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Emergence of Homo sapiens (200,000 years ago)
Evolution of Homo genus (2 million years ago)
Evolution of mammals (200 million years ago)
Evolution of primates (65 million years ago)
Evolution of single-celled organisms into multicellular life (1 billion years ago)
Exploration of the Americas (15th-17th century)

F

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Formation of early civilizations (4,000 years ago)
Formation of the Earth (4.5 billion years ago)

I

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Invention of the plow (3,000 years ago)
Invention of the wheel (4,500 years ago)

R

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Rise of ancient China (2,200 years ago)
Rise of ancient Egypt (3,100 years ago)
Rise of ancient Greece (2,800 years ago)
Rise of ancient Mesopotamia (3,000 years ago)
Rise of ancient Rome (2,800 years ago)
Rise of the Byzantine Empire (5th century)
Rise of the Mongol Empire (12th century)

S

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Spread of Christianity (1st-4th century)

T

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The American Revolution (1775-1783)
The Crusades (11th-13th century)
The Enlightenment (18th century)
The French Revolution (1789-1799)
The Industrial Revolution (18th-19th century)
The Reformation (16th century
The Renaissance (14th-17th century)
The Scientific Revolution (17th century)