By the turn of the eighteenth century, the custom of playing practical jokes on the first of April had become widespread in England, building on older European traditions of springtime foolery traced to France's 1582 calendar reform. Newspapers, neighbors, and eventually broadcasters embraced the day, producing centuries of hoaxes ranging from harmless pranks to elaborate media stunts that fooled millions.
Meeting in the old capital of Tarnovo, Bulgaria's first Grand National Assembly adopted a remarkably liberal constitution on April 1 (Old Style, per the Julian calendar then in use), just months after the country gained autonomy from Ottoman rule following the Russo-Turkish War. The document established a unicameral parliament, broad civil liberties, and universal male suffrage, making Bulgaria one of the more progressive constitutional monarchies in contemporary Europe.
On April 1, 1918, amid the grinding stalemate of the First World War, Britain formally created the Royal Air Force by merging the army's Royal Flying Corps with the navy's Royal Naval Air Service. It was the first air arm in the world to exist as an independent military service, equal in status to the army and navy, reflecting a hard-won belief that air power would decide future wars.
On April 1, 1948, Soviet authorities imposed the first restrictions on Allied road and rail traffic into occupied Berlin, demanding inspection of all military trains entering the Western sectors. The move was a probe of Western resolve amid rising Cold War tensions over currency reform in Germany, and it foreshadowed the full blockade of the city that Stalin would impose just weeks later.
On April Fools' Day 1957, the BBC current-affairs program Panorama broadcast a deadpan report narrated by the trusted journalist Richard Dimmoto, showing Swiss farmers 'harvesting' spaghetti strands from trees. Hundreds of viewers phoned the BBC asking how to grow their own spaghetti tree, a testament both to the era's naivety about foreign cuisine and to the show's reputation for sober factual reporting.
On April 1, 1976, three men signed a partnership agreement in Los Altos, California, creating Apple Computer Company. Steve Wozniak had designed a single-board computer, the Apple I, and Steve Jobs saw a market for it among hobbyists. Ronald Wayne, a colleague from Atari, drew the company's first logo and owned a 10 percent stake he sold back for $800 just twelve days later.