1856: Major events, discoveries, and cultural milestones

International diplomacy and war

In 1856 diplomatic negotiations concluded the Crimean War between Russia and an alliance of Britain, France, the Ottoman Empire and Sardinia. The resulting settlement limited Russian naval power in the Black Sea and affirmed a temporary diplomatic order in eastern Europe. Elsewhere, the so-called Arrow Incident in southern China escalated into the Second Opium War (also called the Arrow War), beginning a renewed round of Anglo‑French military intervention and further pressure on the Qing dynasty.

United States: sectional conflict and politics

Political violence in the U.S. intensified in 1856 as the struggle over slavery in the territories deepened. Notable episodes included the sacking of Lawrence and the Pottawatomie killings in Kansas, incidents tied to the broader "Bleeding Kansas" conflict. In the Senate, Massachusetts senator Charles Sumner was violently assaulted on the Senate floor by Representative Preston Brooks after a fiery speech, an episode that revealed the depth of sectional anger. Politically, the year culminated in a presidential election that elevated tensions between Democrats, the new Republican Party, and the nativist Know-Nothing movement.

Science, culture and notable persons

In August 1856 quarry workers in the Neander Valley (near Düsseldorf, Germany) uncovered skeletal remains later recognized as a distinct archaic human form; this find became central to the study of human evolution and paleontology. The year also marked births and deaths of people who would influence later generations: Sigmund Freud, born in 1856, would found psychoanalysis, while composer Robert Schumann died that year, closing a chapter in Romantic music.

Notable births and deaths (select)

• Births: Sigmund Freud (Austrian neurologist and founder of psychoanalysis).
• Deaths: Robert Schumann (German composer), among others in the arts and sciences.

Beyond singular events, 1856 exemplified mid‑19th century processes: imperial rivalry, the modernization of states, volatile politics driven by ideology and expansion, and expanding scientific inquiry into the natural world. Many incidents and trends from this year fed directly into larger transformations—regional revolutions, global trade and imperial projects, and intellectual developments—that defined the late 19th century.