Directory

1820 CE

A year defined by revolutionary upheaval across southern Europe, the Missouri Compromise dividing American politics over slavery, the first sighting of Antarctica, and the accession of George IV to the British throne.

Geopolitics & Diplomacy

  • King George III of the United Kingdom died on January 29 after nearly sixty years on the throne, and his son George IV formally became king.
  • The Missouri Compromise was passed by the United States Congress on March 3, admitting Missouri as a slave state and Maine as a free state while prohibiting slavery north of the 36°30' parallel in the Louisiana Territory.
  • A liberal revolution erupted in Spain on January 1 when Colonel Rafael del Riego led a military revolt demanding the restoration of the 1812 Constitution, forcing King Ferdinand VII to accept constitutional rule.
  • A revolution broke out in Portugal in August when liberal officers in Porto demanded a constitutional government, leading to the establishment of a provisional junta.
  • The Carbonari launched a revolution in the Kingdom of the Two Sicilies in July, forcing King Ferdinand I to grant a constitution modeled on the Spanish charter of 1812.
  • The Concert of Europe powers convened at the Congress of Troppau in October to discuss responses to the revolutions in southern Europe.
  • The Troppau Protocol was issued by Russia, Austria, and Prussia, asserting the right of the Great Powers to intervene militarily to suppress revolutions threatening European stability.
  • Britain and France declined to sign the Troppau Protocol, signaling a growing divide among the Concert of Europe powers over the principle of intervention.
  • The United States ratified the Adams-Onis Treaty on February 22, formally acquiring Florida from Spain and establishing a boundary between American and Spanish territories in the West.
  • Sweden recognized Norwegian autonomy under the terms of the Act of Union, allowing Norway to maintain its own parliament and domestic governance.

Conflict & Security

  • The Cato Street Conspiracy was uncovered in London on February 23 when police arrested a group of radicals plotting to assassinate the entire British Cabinet at a dinner.
  • Arthur Thistlewood and four other conspirators from the Cato Street plot were hanged and beheaded on May 1 for high treason.
  • The Berry Assassination occurred in Paris on February 13 when the Duke of Berry, heir to the French throne, was stabbed by Louis Pierre Louvel outside the Paris Opera.
  • The Semyonovsky Regiment mutinied in St. Petersburg in October 1820, shocking Tsar Alexander I and contributing to his increasingly conservative turn against liberal reform.
  • Riego's revolt in Spain triggered a military uprising that spread across Andalusia and eventually forced Ferdinand VII to restore constitutional government by March.
  • Ali Pasha of Ioannina, the semi-independent Ottoman governor of western Greece, entered into open revolt against the Ottoman Sultan Mahmud II.
  • Slave revolts erupted in several colonies across the Caribbean as enslaved populations resisted plantation conditions.
  • Piracy remained a significant threat in the Caribbean and the South China Sea, prompting continued naval patrols by European powers.
  • The Neapolitan revolution brought constitutional government to the Kingdom of the Two Sicilies, but Austria began planning military intervention to restore absolute rule.
  • The Portuguese revolution succeeded without significant bloodshed, as military garrisons across the country rallied to the liberal cause.

Economy & Finance

  • The global economy continued its recovery from the disruptions caused by the Napoleonic Wars and the post-war depression of 1815 to 1819.
  • The Panic of 1819 continued to affect the American economy, causing widespread bank failures, foreclosures, and unemployment across the western frontier states.
  • Cotton production in the American South expanded rapidly, driven by growing demand from British textile mills.
  • Britain's Industrial Revolution accelerated as steam-powered factories spread across the Midlands and northern England.
  • The price of wheat in Britain fell sharply, causing distress among agricultural laborers and contributing to rural unrest.
  • Trade between Britain and its colonies expanded significantly, with raw materials flowing to British factories and manufactured goods exported to colonial markets.
  • The Bank of England resumed gold-standard convertibility of banknotes, stabilizing British currency after the wartime suspension.
  • American land speculation collapsed in the wake of the Panic of 1819, leaving many settlers with debts they could not repay.
  • France continued to pay war indemnities imposed by the Congress of Vienna, straining the national treasury.
  • Russian grain exports grew as the empire expanded cultivation into the fertile black earth regions of southern Russia.

Technology & Infrastructure

  • British engineers continued to experiment with iron hull construction for ships, advancing techniques that would soon produce the first iron-hulled steamships.
  • The Regent's Canal in London was completed, providing a navigable waterway linking the Grand Junction Canal to the Thames at Limehouse.
  • Hans Christian Oersted discovered that an electric current produces a magnetic field, demonstrating the connection between electricity and magnetism for the first time.
  • Road construction continued across Britain using the macadam method developed by John Loudon McAdam, producing smoother and more durable road surfaces.
  • Canal construction expanded across the eastern United States as states invested in waterway infrastructure to facilitate trade.
  • The development of the puddling process for producing wrought iron continued to improve the quality and quantity of iron available for construction and manufacturing.
  • Gas lighting spread to more streets and buildings in London and other major European cities, replacing oil lamps.
  • Steam engines became increasingly efficient as engineers refined designs based on the high-pressure principles demonstrated by Richard Trevithick.
  • Early experimental work on electromagnetic phenomena inspired by Oersted's discovery prompted researchers across Europe to investigate the relationship between electricity and magnetism.
  • The use of steam-powered printing presses expanded, enabling newspapers and books to be produced more rapidly and at lower cost.

Science & Discovery

  • Antarctica was sighted for the first time on January 27 by a Russian expedition led by Fabian Gottlieb von Bellingshausen and Mikhail Lazarev aboard the Vostok and Mirny.
  • British naval officer Edward Bransfield sighted the Antarctic Peninsula on January 30, just days after the Russian expedition's observation.
  • American sealer Nathaniel Palmer also claimed to have sighted Antarctica in November while sailing from the South Shetland Islands.
  • Hans Christian Oersted published his groundbreaking observation that a compass needle was deflected by an electric current, founding the field of electromagnetism.
  • Andre-Marie Ampere quickly built upon Oersted's discovery, developing mathematical descriptions of the relationship between electric currents and magnetic fields.
  • The Royal Astronomical Society was founded in London on January 12 to promote astronomical research and observation.
  • French chemist Henri Braconnot discovered chitin by studying mushrooms, identifying a new class of organic compounds.
  • The South Shetland Islands were explored extensively by British and American sealers, who charted coastlines and discovered new islands.
  • Christian Friedrich Nasse formulated the observation that hemophilia occurs almost exclusively in males, later known as Nasse's law.
  • Geological surveys expanded across Europe as scientists sought to map rock formations and understand the history of the earth.

Health & Medicine

  • Yellow fever outbreaks struck port cities along the American Gulf Coast, killing hundreds and disrupting trade.
  • Vaccination against smallpox continued to spread across Europe following Edward Jenner's pioneering work, reducing mortality in many regions.
  • Cholera remained endemic in the Indian subcontinent, claiming thousands of lives annually in Bengal and surrounding provinces.
  • Hospitals in major European cities remained overcrowded and unsanitary, with high rates of infection and postoperative mortality.
  • Traditional herbal remedies continued to dominate medical practice in most of the world, as scientific medicine remained in its early stages.
  • Quinine derived from cinchona bark remained the primary treatment for malaria across tropical colonies.
  • The Royal College of Surgeons in London continued efforts to standardize surgical training and licensing in England.
  • Maternal mortality remained extremely high across Europe and the Americas, with puerperal fever killing many women after childbirth.
  • Mental health treatment relied heavily on confinement in asylums, where conditions were often harsh and therapeutic options limited.
  • Public health measures in European cities remained rudimentary, with most urban populations lacking access to clean water and proper sanitation.

Climate & Environment

  • The global climate continued to recover from the volcanic cooling effects of the 1815 eruption of Mount Tambora, which had caused the Year Without a Summer in 1816.
  • Deforestation accelerated in the eastern United States as settlers cleared vast tracts of forest for agriculture and timber.
  • Whaling fleets from New England and Britain expanded their operations into the Pacific Ocean, depleting whale populations in the Atlantic.
  • The Thames River in London was increasingly polluted by industrial waste and raw sewage, contributing to frequent outbreaks of waterborne disease.
  • Seal populations in the South Atlantic and around the South Shetland Islands were devastated by commercial hunting expeditions.
  • Coal mining expanded rapidly in Britain as industrial demand for fuel grew, scarring landscapes and polluting waterways.
  • Agricultural practices across Europe continued to transform the landscape as common lands were enclosed and converted to private farmland.
  • Deforestation in the Caribbean intensified as sugar plantations expanded onto previously forested land.
  • Atmospheric carbon dioxide concentration was approximately 283 parts per million, as later confirmed by ice core analysis.
  • Flooding along major European rivers caused periodic destruction of crops and settlements in low-lying areas.

Culture & Society

  • Percy Bysshe Shelley published Prometheus Unbound, a major work of English Romantic poetry.
  • Alphonse de Lamartine published Meditations Poetiques, a landmark collection that established him as a leading voice of French Romantic poetry.
  • The Venus de Milo, an ancient Greek statue, was discovered on the island of Milos and later acquired by France for the Louvre.
  • The Royal Astronomical Society was founded in London on January 12 to promote and support astronomical research and education.
  • The abolitionist movement gained momentum in Britain, with growing public campaigns demanding an end to the slave trade and slavery itself.
  • Sir Walter Scott published Ivanhoe, a historical romance set in medieval England that became enormously popular across Europe.
  • The Romantic movement in art and literature flourished across Europe, emphasizing emotion, nature, and individual expression.
  • The University of Virginia was chartered by the Virginia General Assembly based on plans drawn by Thomas Jefferson.
  • Missionary societies expanded their activities in Africa, Asia, and the Pacific, spreading Christianity alongside colonial influence.
  • The world population was approximately 1.078 billion.