April 3

Edward the Confessor is crowned King of England at Winchester Cathedral.

Edward the Confessor, a member of the House of Wessex who had spent much of his youth in exile in Normandy, was crowned King of England at Winchester Cathedral. His largely peaceful but ultimately childless reign set the stage for the succession crisis that followed his death in 1066, a dispute that culminated in the Norman Conquest led by William the Conqueror.

The Peace of Cateau-Cambrésis is signed, ending decades of conflict between France, Spain, and other European powers known as the Italian Wars.

France and Spain, along with England, signed the Peace of Cateau-Cambrésis, ending nearly six decades of intermittent warfare fought largely over control of Italian territory. The treaty confirmed Spanish dominance over much of Italy and marked a significant decline in French influence on the peninsula, reshaping the balance of power in Europe for generations to come.

Robert Walpole becomes First Lord of the Treasury, generally regarded as making him the first Prime Minister of Great Britain.

Robert Walpole was appointed First Lord of the Treasury by King George I amid the fallout of a major financial scandal, a position from which he came to dominate British politics for the next two decades. Though the title "Prime Minister" was not yet officially recognized, Walpole is widely regarded by historians as Britain's first, establishing many conventions of the modern office.

The Pony Express begins operation, carrying mail between Missouri and California in record time using relays of horseback riders.

The Pony Express began operation, using a relay system of horseback riders to carry mail nearly 1,900 miles between St. Joseph, Missouri, and Sacramento, California, in about ten days, a dramatic improvement over previous overland routes. Though it operated for only about eighteen months before being rendered obsolete by the transcontinental telegraph, the service became a lasting symbol of the American frontier.

Union forces capture Richmond, Virginia, the Confederate capital, as the Civil War nears its end.

Union troops entered Richmond, Virginia, the capital of the Confederacy, after Confederate forces evacuated the city and set fire to warehouses and bridges to prevent supplies from falling into enemy hands. The fires spread and destroyed much of the city's business district. The fall of Richmond came just days before General Robert E. Lee's surrender, effectively signaling the Confederacy's collapse.

Outlaw Jesse James is shot and killed by Robert Ford, a member of his own gang seeking a reward.

Robert Ford, a member of Jesse James's own outlaw gang, shot and killed the notorious train and bank robber in his home in St. Joseph, Missouri, hoping to collect a reward and a promised pardon for earlier crimes. Rather than being celebrated as a hero, Ford was widely reviled as a coward and traitor, a reputation immortalized in folk ballads and later films about the incident.

President Harry Truman signs the Marshall Plan into law, authorizing billions of dollars in aid to rebuild war-torn Europe.

President Harry Truman signed the Economic Cooperation Act, formally launching the Marshall Plan, which authorized more than $12 billion in American aid to help rebuild the shattered economies of Western Europe after World War II. Named for Secretary of State George Marshall, the program is widely credited with speeding European recovery and helping contain the spread of communism during the early Cold War.

Motorola engineer Martin Cooper makes the first handheld mobile phone call, calling a rival at Bell Labs.

Standing on a New York City street, Motorola engineer Martin Cooper placed the first call ever made on a handheld, portable cellular telephone, reportedly dialing a rival researcher at Bell Labs to announce the achievement. The bulky prototype, which took another decade to reach consumers, marked a pivotal step toward the mobile phones that would later transform global communication.

The Osborne 1, the first commercially successful portable computer, is unveiled in San Francisco.

The Osborne 1, designed by Adam Osborne, debuted at the West Coast Computer Faire in San Francisco as the first commercially successful portable computer, weighing about 24 pounds and featuring a small built-in screen, keyboard, and floppy disk drives packaged into a single suitcase-like unit. Though primitive by later standards, it demonstrated real consumer demand for computing power that could travel beyond the office.

The Panama Papers leak becomes public, exposing a vast network of offshore shell companies used by the wealthy and powerful to hide assets.

An anonymous source leaked more than 11 million documents from the Panamanian law firm Mossack Fonseca to journalists, revealing an extensive global network of offshore shell companies used by wealthy individuals, celebrities, and political leaders to shield assets and, in some cases, evade taxes or launder money. The Panama Papers investigation, coordinated by journalists across dozens of countries, led to resignations, investigations, and new financial transparency regulations worldwide.