1820s

1820

Missouri Compromise

1821

Greek War of Independence Declared

Greek insurrection against Ottoman rule ignited European Romantic support, fractured Ottoman stability, and reestablished an independent Hellenic state after 400 years.

1821

Greek Independence from Ottoman Rule

The Greek War of Independence ignited a decade-long conflict that challenged Ottoman dominion and inspired European Philhellenic movements throughout the Romantic era.

1821

Greek War of Independence begins

1821

First English language daily newspaper in India launched

1821

Chepstow Castle explosion disaster

1822

Rosetta Stone Deciphered

Champollion's breakthrough cracked Egyptian hieroglyphics and unlocked three millennia of lost civilization, revolutionizing archaeology and linguistics.

1822

Brazilian Declaration of Independence

Pedro I's peaceful separation from Portugal created the largest Latin American nation and only American empire to survive the 19th century.

1823

Monroe Doctrine announced

1824

Carnot Cycle Formulated

Sadi Carnot's theoretical framework for heat engines established the mathematical foundation for thermodynamics and the limits of mechanical efficiency.

1824

Battle of Ayacucho

The final major battle of the South American Wars of Independence clinched Spanish imperial collapse and secured republican futures across the continent.

1825

First Passenger Steam Railway Operates

The Stockton & Darlington Railway is already covered, but the Liverpool-Manchester line (1830) surpassed it as the first commercial passenger service.

1825

First Passenger Railway Opens (Stockton & Darlington)

1827

Battle of Navarino

Battle of Navarino

1828

US Presidential Election of 1828

Andrew Jackson's victory initiated the Democratic Party's rise and marked the first mass-participation presidential campaign, reshaping American electoral politics.

1829

Steam Locomotive Triumphs

The Rainhill Trials crowned George Stephenson's Rocket as the definitive locomotive design, securing steam power as the engine of the railway age and industrial transformation.