February 15

Christopher Columbus writes a letter describing his discoveries in the New World while sailing back to Spain, one of the first written accounts of the Americas to reach Europe.

Columbus's letter, describing the peoples, geography, and resources of the lands he had encountered, was quickly printed and circulated across Europe, becoming one of the first widely read accounts of the New World and helping spark the age of European exploration and colonization that followed.

French fur traders establish the settlement of St. Louis in Spanish Louisiana, which would grow into a major American gateway city.

French fur trader Pierre Laclède and his associates established the trading post at a strategic location along the Mississippi River, naming it for King Louis IX of France. St. Louis grew into a major hub for westward American expansion and later earned the nickname "Gateway to the West."

French troops invade Rome and proclaim the Roman Republic, forcing Pope Pius VI into exile.

French revolutionary forces occupied Rome and deposed the pope's temporal authority, establishing a short-lived republic modeled on France's own revolutionary government. The Roman Republic collapsed within a year as opposing forces restored papal rule, though it foreshadowed the eventual end of the Papal States decades later.

The battleship USS Maine explodes in Havana harbor, killing over 250 sailors and helping spark the Spanish-American War.

The Maine's explosion, whose cause remains debated among historians, killed most of its crew and was quickly blamed on Spain by the sensationalist "yellow journalism" of American newspapers, under the rallying cry "Remember the Maine." Public outrage helped push the United States into war with Spain just months later.

Singapore falls to Japanese forces in the largest surrender of British-led troops in history, a major blow to British colonial prestige.

The fall of Singapore, a British fortress long considered impregnable, came after Japanese forces advanced rapidly down the Malay Peninsula and overwhelmed the city's defenses, which had been designed primarily to repel a naval attack rather than an assault from the landward side.

ENIAC, the first general-purpose electronic computer, is formally dedicated, ushering in the modern computing era.

Built to calculate artillery firing tables for the U.S. Army, ENIAC filled an entire room and used thousands of vacuum tubes, yet was far faster than any calculating device before it. Its dedication marked a foundational moment in the development of general-purpose electronic computing.

Canada adopts its red maple leaf flag, replacing the Canadian Red Ensign after a fierce national debate over the design.

Canada's flag debate, dubbed the "Great Flag Debate," pitted supporters of the traditional Red Ensign, which featured the Union Jack, against advocates of a new, uniquely Canadian symbol. The maple leaf design, chosen after months of parliamentary wrangling, became a powerful and now-iconic symbol of Canadian national identity.

The United Kingdom switches to a decimal currency system on "Decimal Day," abandoning the centuries-old pounds, shillings, and pence system.

"Decimal Day" replaced Britain's centuries-old system of 12 pence to a shilling and 20 shillings to a pound with a simpler 100 pence to a pound. The changeover required an extensive public education campaign and new coinage, and remains a shared cultural memory for older generations who grew up under the old system.

The first working draft of the complete human genome sequence is published, a landmark moment in genetics and medicine.

The publication of the draft human genome sequence, the product of a massive international scientific collaboration, mapped the vast majority of human genetic code for the first time. It opened new frontiers in medical research, genetic disease diagnosis, and personalized medicine that continue to expand today.

Coordinated protests across more than 600 cities worldwide oppose the looming U.S.-led invasion of Iraq, in what is considered the largest single-day protest event in history.

Held just weeks before the U.S.-led invasion of Iraq began, the coordinated protests spanned cities across six continents, reflecting widespread global opposition to the war despite the eventual invasion proceeding regardless. Organizers and researchers have cited it as the largest globally coordinated protest event in recorded history.