Directory

1845 CE

A year defined by the annexation of Texas by the United States, the beginning of the devastating Irish Potato Famine, and the outbreak of the First Anglo-Sikh War in the Punjab.

Geopolitics & Diplomacy

  • The United States Congress passed a joint resolution on March 1 authorizing the annexation of the Republic of Texas, which accepted the offer on July 4.
  • Texas was formally admitted as the twenty-eighth state of the United States on December 29.
  • James K. Polk was inaugurated as the eleventh President of the United States on March 4, committed to a policy of territorial expansion.
  • The phrase Manifest Destiny was coined by journalist John L. O'Sullivan in the United States Magazine and Democratic Review, articulating the belief that American expansion across the continent was divinely ordained.
  • The United States Naval Academy was established at Annapolis, Maryland, on October 10 to train officers for the growing American navy.
  • The Anglo-French entente strained over competing interests in the Pacific, North Africa, and the question of Spanish royal marriages.
  • The Swiss federal diet debated the future of the Sonderbund, a defensive alliance of Catholic cantons that threatened the unity of the Swiss Confederation.
  • British influence expanded in Borneo as James Brooke consolidated his position as Rajah of Sarawak.
  • The Kingdom of Madagascar resisted French colonial pressure, maintaining its independence under Queen Ranavalona I.
  • China opened the five treaty ports stipulated in the Treaty of Nanking, though restrictions on foreign trade and movement persisted.

Conflict & Security

  • The First Anglo-Sikh War began in December when Sikh forces crossed the Sutlej River into British-controlled territory in India.
  • The Battle of Mudki on December 18 saw British forces defeat Sikh troops in the opening engagement of the First Anglo-Sikh War.
  • The Battle of Ferozeshah on December 21-22 was a hard-fought British victory over Sikh forces, with heavy casualties on both sides.
  • Mexico severed diplomatic relations with the United States following the American annexation of Texas, which Mexico still claimed as its own territory.
  • The Anglo-French naval expedition against Argentina's dictator Juan Manuel de Rosas began with the blockade of the Rio de la Plata.
  • The Battle of Vuelta de Obligado on November 20 saw Argentine forces attempt to block an Anglo-French fleet from navigating the Parana River.
  • Imam Shamil's forces in the North Caucasus continued to resist Russian imperial expansion through guerrilla warfare.
  • Maori resistance to British settlement intensified in New Zealand as disputes over land sales fueled conflict.
  • The Flagstaff War began in the Bay of Islands, New Zealand, as the Maori chief Hone Heke repeatedly cut down the British flagstaff at Kororareka.
  • Abd el-Kader's resistance to French colonial rule in Algeria continued despite military setbacks and the loss of territory.

Economy & Finance

  • The Irish Potato Famine began when the potato blight Phytophthora infestans destroyed a large portion of the Irish potato crop, threatening the food supply of millions.
  • Railway Mania reached its peak in Britain as speculative investment in railway companies attracted enormous amounts of capital.
  • Parliament authorized hundreds of new railway lines during the Railway Mania, many of which would prove unprofitable.
  • The repeal of the Corn Laws became a major political issue in Britain as free trade advocates argued that tariffs on grain imports raised food prices for the poor.
  • Cotton remained the most valuable American export, with the southern states producing the majority of the world's supply.
  • The rubber industry expanded following Charles Goodyear's vulcanization process, creating new markets for rubber goods.
  • The expansion of the telegraph promised to transform commercial communications, allowing rapid transmission of market information.
  • The British East India Company maintained its commercial and administrative dominance over the Indian subcontinent.
  • Trade between the United States and China grew following the Treaty of Wanghia, with American merchants establishing operations in treaty ports.
  • The global sugar trade continued to shift as beet sugar production in Europe challenged cane sugar from Caribbean plantations.

Technology & Infrastructure

  • The SS Great Britain departed on its maiden voyage from Liverpool to New York on July 26, crossing the Atlantic in fourteen days as the largest ship afloat.
  • The pneumatic tire was patented by Robert William Thomson, though the invention would not become commercially successful until decades later.
  • The expansion of telegraph lines across the eastern United States connected cities from Washington to New York.
  • Railway construction continued at an unprecedented pace in Britain, with thousands of miles of new track under construction.
  • The rotary printing press developed by Richard Hoe was adopted by major newspapers, dramatically increasing print production speeds.
  • The construction of the Moscow-Saint Petersburg Railway began, one of the most ambitious engineering projects in Russia.
  • Elias Howe developed a practical sewing machine design that would lead to a patent in 1846, laying the foundation for the mechanization of garment manufacturing.
  • Iron-hulled ships became increasingly common in commercial shipping, offering greater durability and cargo capacity than wooden vessels.
  • The expansion of gas lighting networks in European cities improved public safety and extended the hours of commercial activity.
  • Advances in steam engine efficiency reduced fuel consumption and increased the range and speed of steamships and locomotives.

Science & Discovery

  • Alexander von Humboldt published the first volume of Kosmos, a comprehensive survey of the physical universe that became a landmark of scientific literature.
  • Michael Faraday discovered the phenomenon of diamagnetism and the rotation of the plane of polarization of light by a magnetic field, known as the Faraday effect.
  • The planet Neptune was being independently predicted by both John Couch Adams in England and Urbain Le Verrier in France through mathematical calculations.
  • The German naturalist and explorer Ludwig Leichhardt completed an overland expedition from Brisbane to Port Essington in northern Australia.
  • William Parsons, the Earl of Rosse, completed the construction of the Leviathan of Parsonstown, the largest telescope in the world, and used it to observe the spiral structure of galaxies.
  • The development of thermodynamics advanced as physicists refined their understanding of heat, work, and energy conservation.
  • Geological surveys expanded in the western United States, mapping mineral deposits and topography ahead of settlement.
  • The study of fungi and plant diseases gained urgency as the potato blight devastated crops across Ireland and parts of Europe.
  • Robert Chambers' anonymously published Vestiges of the Natural History of Creation continued to provoke debate about evolution and the origins of life.
  • Advances in analytical chemistry allowed scientists to identify and classify new chemical elements and compounds with greater precision.

Health & Medicine

  • The Irish Potato Famine created a public health catastrophe as malnutrition weakened the population and increased vulnerability to typhus, relapsing fever, and dysentery.
  • The use of ether as a surgical anesthetic advanced as physicians in the United States and Europe experimented with its application.
  • Cholera remained endemic in many parts of Asia and continued to threaten European and American cities.
  • The practice of quarantine was employed at ports across Europe and the Americas to control the spread of infectious diseases.
  • Advances in microscopy allowed pathologists to examine diseased tissues in greater detail, improving diagnostic capabilities.
  • Public health reformers in Britain continued to advocate for improved sanitation, clean water supplies, and better housing for the poor.
  • The high mortality rate among soldiers serving in tropical climates remained a major challenge for European colonial militaries.
  • Medical education in Europe became increasingly standardized, with clinical training at teaching hospitals becoming a core requirement.
  • Homeopathy gained popularity in Europe and the United States as an alternative to the harsh treatments of conventional medicine.
  • The link between poverty and poor health was increasingly documented by social reformers and public health investigators.

Climate & Environment

  • Atmospheric carbon dioxide concentration was approximately 285 parts per million, as later confirmed by ice core analysis.
  • The potato blight that caused the Irish Famine was exacerbated by wet weather conditions that favored the spread of the Phytophthora infestans pathogen.
  • Deforestation in the American Midwest accelerated as settlers cleared prairies and woodlands for farming.
  • The Great Fire of Pittsburgh on April 10 destroyed over a thousand buildings in the city center, highlighting the vulnerability of densely built wooden cities.
  • Guano mining on islands off the coast of Peru expanded rapidly, depleting seabird nesting sites and disrupting coastal ecosystems.
  • The expansion of cattle ranching in the Argentine Pampas continued to transform native grasslands.
  • Coal mining in the Ruhr Valley of Germany expanded, fueling industrialization and increasing local air and water pollution.
  • Floods and storms affected agricultural regions across Europe, contributing to crop failures and food insecurity.
  • The introduction of European farming practices to colonial territories altered soil composition and water management patterns.
  • Overfishing in the North Atlantic reduced populations of cod and other commercially important fish species.

Culture & Society

  • The world population was approximately 1.207 billion.
  • Frederick Douglass published his autobiography Narrative of the Life of Frederick Douglass, an American Slave, providing a powerful firsthand account of slavery.
  • Edgar Allan Poe published The Raven in January, establishing the poem as one of the most famous works in American literature.
  • Alexandre Dumas published The Count of Monte Cristo as a serial novel, creating an enduring tale of betrayal, imprisonment, and revenge.
  • The Irish Famine triggered the beginning of a mass emigration from Ireland that would reshape the demographics of the United States, Canada, and Australia.
  • Richard Wagner's opera Tannhauser premiered in Dresden on October 19, furthering his reputation as an innovative composer.
  • Henry David Thoreau began his experiment in simple living at Walden Pond in Concord, Massachusetts, on July 4.
  • The movement for women's rights gained support in the United States, with advocates pressing for property rights and access to education.
  • The expansion of public schooling continued in several American states and European countries, though access remained unequal.
  • The abolitionist movement in the United States intensified as opponents of slavery organized politically and conducted rescues of fugitive slaves.