March 6 carries more historical weight than most calendars let on. From a landmark chemistry presentation in St Petersburg to a colonial treaty signed on the Iberian Peninsula, the date sits at the crossroads of science, politics and human conflict. The events below span five centuries and touch almost every corner of the world.
Portugal Cedes the Canary Islands – 1479
The Treaty of Alcáçovas reshaped the colonial ambitions of two Iberian powers. Portugal agreed to hand over the Canary Islands to Castile, and in return secured recognition of its claims along the West African coast. The deal marked an early attempt to divide the wider world between European rivals.
The First Fleet Reaches Norfolk Island – 1788
Britain’s First Fleet arrived at Norfolk Island, a remote territory in the South Pacific, to establish a convict settlement. The island was chosen for its timber and flax, both considered useful to the Royal Navy. It became one of several penal outposts Britain set up during this period of colonial expansion.
The Fall of the Alamo – 1836
After 13 days of siege, Mexican forces under General Santa Anna stormed the Alamo in San Antonio, Texas. Between 1,500 and 3,000 soldiers overwhelmed the outnumbered Texan defenders. Around 182 to 257 Texans were killed, among them William Travis, Jim Bowie and the frontiersman Davy Crockett. The battle became a defining moment in the Texas Revolution.
The Dred Scott Ruling – 1857
The United States Supreme Court delivered one of its most contested rulings when it decided that African Americans, whether enslaved or free, could not hold US citizenship. The Dred Scott decision deepened divisions between North and South and is widely regarded as a catalyst for the Civil War that followed four years later.
Mendeleev’s Periodic Table – 1869
Russian chemist Dmitri Mendeleev presented his first periodic table of the elements to the Russian Chemical Society. He arranged known elements by atomic weight and left gaps for elements not yet discovered. His framework proved remarkably accurate and remains the foundation of modern chemistry.
Aspirin Gets Its Patent – 1899
Felix Hoffmann, a chemist at the German pharmaceutical company Bayer, secured a patent for acetylsalicylic acid, sold under the name Aspirin. The drug went on to become one of the most widely used medicines in history, prescribed for pain relief, fever and, later, cardiovascular conditions.
Pennsylvania’s Four-Inch Rule – 1921
Police in Sunbury, Pennsylvania, issued an order requiring women to wear skirts no less than four inches below the knee. It was one of several morality-driven dress codes enforced in American towns during the early 20th century. The edict attracted little lasting compliance.
Ghana’s Independence – 1957
The Gold Coast became Ghana, the first sub-Saharan African country to gain independence from Britain. Prime Minister Kwame Nkrumah led the transition, and the moment was celebrated across the continent as proof that colonial rule could be peacefully dismantled.
Stalin’s Daughter Defects – 1967
Svetlana Alliluyeva walked into the US Embassy in New Delhi and requested political asylum. The daughter of Soviet leader Joseph Stalin, her defection caused considerable embarrassment in Moscow and attracted intense media interest across the world.
Chandrasekhar Steps Down – 1991
Indian Prime Minister Chandra Shekhar resigned from office, ending a brief and fragile administration that had lasted just seven months. His minority government had relied on outside support from the Congress party, which it lost amid deepening political tensions.
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